I’m working on a Biology question and need guidance to help me study.
Which type of reproductive barrier separates a pair of jellyfish species that could interbreed except that one lives near the surface of the ocean and the other lives in the very deep sea?
What is the source of most variability found within populations?
organisms need traits so they get them
On a coral reef, it is difficult for very large knobby starfish to find enough food while very small knobby starfish have few defenses and are gobbled up by predators very quickly. As a consequence, the majority of the knobby starfish on this reef are medium-sized. This is an example of which type of selection?
frequency dependent selection
It is believed that humans are currently causing the 6th mass extinction.
A large population of finches lives in a forest. The majority of these finches have red feathers on their chest and belly but there are a few with yellow feathers and a few with blue feathers. A huge wildfire sweeps through the forest so quickly that most of the birds cannot escape. Once the fire is gone, only a few finches remain and all of them have yellow feathers except one lone finch that has red feathers. This is an example of:
the founder effect
the bottleneck effect
In the evolutionary tree below, which letter represents the most recent common ancestor of giraffes and birds?
Giraffes and birds are not related – that’s crazy talk
Structures, like the appendix in humans, that have little or no current importance to the organism yet are homologous to functional organs in another organism are called:
The shift in fur color within populations of rock pocket mice that live on hardened lava flows is an example of:
Where did Charles Darwin make some of his most important observations (about creatures like the marine iguana and giant tortoise)?
Comparative embryology has shown us that which of the following are traits that humans, mice, chickens, bats, alligators, and all other chordates share as embryos but not necessarily as adults?
a tail and gills
webbed feet and feathers
a backbone and an umbilical cord
scales and gills
fur and a tail
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