Why do mass extinctions wipe out species more or less randomly?
Why do mass extinctions wipe out species more or less randomly? They are caused by exceptionally harsh, short-term conditions. How can mass extinction events be distinguished from background extinctions? A mass extinction occurs when at least 60 percent of species are wiped out within 1 million years.
What best defines adaptive radiation?
Adaptive radiation is a rapid increase in the number of species with a common ancestor, characterized by great ecological and morphological diversity. The driving force behind it is the adaptation of organisms to new ecological contexts.
Which is strong evidence supporting the impact hypothesis?
Which is strong evidence supporting the impact hypothesis for the extinction of the dinosaurs? See Section 25.4 (Page 512). D – Presence of an element abundant only in asteroids and meteorites supports the hypothesis that an asteroid impact occurred at the K-P boundary, around the time dinosaurs went extinct.
What is genetic drift quizlet Chapter 24?
a set of organisms with a unique genetic history. What is genetic drift? A change in allele frequencies caused by random events.
How many times has the Earth been destroyed?
In the last half-billion years, life on Earth has been nearly wiped out five times—by such things as climate change, an intense ice age, volcanoes, and that space rock that smashed into the Gulf of Mexico 65 million years ago, obliterating the dinosaurs and a bunch of other species.
How many times has Earth been wiped out?
Now we're facing a sixth. There have been five mass extinction events in Earth's history. In the worst one, 250 million years ago, 96 percent of marine species and 70 percent of land species died off.
What kinds of characters can you use to create a data matrix for estimating phylogenetic trees?
What kinds of characters can you use to create a data matrix for estimating phylogenetic trees? Any heritable trait (whether morphological, molecular, physiological, behavioral, or developmental) can be used as a character in a data matrix to estimate a phylogeny.
How could the duplication of the Hox gene complex help facilitate animal adaptive radiation?
Why would gene duplication events, such as those seen in the Hox gene complex, set the stage for adaptive radiation? One copy of a gene can perform the original function, while other copies are available to take on new functions.
Will the Moon ever crash into Earth?
1:1712:31What Happens if the Moon Crashes into Earth? – YouTubeYouTube
What is the Moon for kids?
The Moon is a large natural object that orbits, or travels around, Earth. After the Sun it is the brightest object in the sky. The average distance between the Moon and Earth is about 238,900 miles (384,400 kilometers). Compared to the distance between other planets and Earth, this distance is small.
What is genetic drift quizlet mastering biology?
What is genetic drift? A change in allele frequencies caused by random events.
How did the drought lead to an increase in beak size in the medium ground finch population?
depending on the size of the seeds it eats. The drought caused a mutation that led to larger beak sizes in the finch population. Birds that could eat larger, tougher seeds survived and reproduced during the drought. Beak size varies among the birds in the finch population under study.
How long will humans last?
Humanity has a 95% probability of being extinct in 7,800,000 years, according to J.
Will humans go extinct soon?
Scientists estimate modern humans have been around about 200,000 years, so that should give us at least another 800,000 years. Other scientists believe we could be here another two million years…or even millions of years longer. On the other hand, some scientists believe we could be gone in the next 100 years.
How long do humans have left?
Humanity has a 95% probability of being extinct in 7,800,000 years, according to J.
What are two different types of data that can be analyzed to build a phylogenetic tree?
Many different types of data can be used to construct phylogenetic trees, including morphological data, such as structural features, types of organs, and specific skeletal arrangements; and genetic data, such as mitochondrial DNA sequences, ribosomal RNA genes, and any genes of interest.
Which of the following information would be most useful in creating a phylogenetic tree of a taxon?
Answer and Explanation: (a) Morphological data from fossil and living species would be most useful in creating a phylogenetic tree of a taxon.
Why would gene duplication events such as those seen in the Hox gene complex set the stage for adaptive radiation quizlet?
Why would gene duplication events, such as those seen in the Hox gene complex, set the stage for adaptive radiation? One copy of a gene can perform the original function, while other copies are available to take on new functions.
Which factor is the most likely explanation for the fact that animals and plants in India differ greatly from species in nearby Southeast Asia?
Which factor most likely caused animals and plants in India to differ greatly from species in nearby southeast Asia? The species became separated by convergent evolution.
Will the Sun explode?
No supernova, no black hole Our sun isn't massive enough to trigger a stellar explosion, called a supernova, when it dies, and it will never become a black hole either. In order to create a supernova, a star needs about 10 times the mass of our sun.
Is the Moon going to explode?
Fortunately the Moon is over two hundred thousand miles away, so such an event is pretty unlikely for now. But it is not inconceivable. Billions of years from now the Sun, as it begins to die, will start to expand. The outer layers of the Sun could reach all the way to the Earth.
What does the Moon smell like?
After walking on the Moon astronauts hopped back into their lunar lander, bringing Moon dust with them. They were surprised, and perplexed, to find that it smelled like spent gunpowder.
Is the Moon a rock?
The composition of the Moon is much like that of the Earth. Its rocks are similar to Earth rocks and contain many but not all of the same minerals.
What is a gene pool mastering biology quizlet?
gene pool. (All the alleles of all the genes of a population make up a gene pool.) You just studied 64 terms! 1/64.
How do stabilizing and disruptive selection differ See section 23.3 page?
How do stabilizing and disruptive selection differ? See Section 23.3 (Page 507) . Stabilizing selection reduces the amount of variation in a trait. Disruptive selection increases the amount of variation in a trait.
How did drought and rain storms on Daphne Major island affect the population of medium ground finches?
Recently they reported a change in the beak size of the medium ground finch on Daphne Major. In 1977 a drought reduced the number of small seeds available for the birds, forcing them to rely on larger seeds requiring considerable force to open.
Which factors most likely had a role in the development of beak characteristics in the medium ground finch?
The most likely explanation for the increase in average beak size of the medium ground finch is that the
- A. Trait is inherited and birds with larger beaks have greater reproductive success.
- B. Lack of small seeds caused a mutation which resulted in a larger beak.
- C. …
- D.
Who is the first human?
Homo habilis The First Humans One of the earliest known humans is Homo habilis, or “handy man,” who lived about 2.4 million to 1.4 million years ago in Eastern and Southern Africa.
What year will humans go extinct?
There have been a number of other estimates of existential risk, extinction risk, or a global collapse of civilization: Humanity has a 95% probability of being extinct in 7,800,000 years, according to J.
What will humans look like in 100 000 years?
100,000 Years From Today We will also have larger nostrils, to make breathing easier in new environments that may not be on earth. Denser hair helps to prevent heat loss from their even larger heads. Our ability to control human biology means that the man and woman of the future will have perfectly symmetrical faces.