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The end-cretaceous extinctions were followed by the . a. adaptive radiation of mammals and birds b. appearance of hard-shelled marine organisms c. appearance of first land plants d. insects?
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∙ 13y ago
The answer is a.
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∙ 13y ago
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How do mass extinctions appear to be related to the appearance of new major groups of organisms?
I was thinking the same thing. i think that its because when one group goes extinct the new major group thrives because somehow the now extinct group died off.
The organisms appearance is known as the?
phenotype
An organisms appearance is known as?
phenotype
What is what is an organisms outward appearance?
The phenotype.
What doE phenotype?
an organisms phiscal appearance
Is it true an organism's physical appearance is its genotype?
False. An organisms physical appearance is its phenotype.
What is the group with the most extinctions?
This is an interesting question and not one that is easily answered. In terms of the entire history of life on earth the groups of individual species that have been around the longest would have experienced the most extinctions. The more complex the animal the fewer organisms produced and therefore the fewer species available for extinction. This makes various unicelluar organisms (animal, plant and bacterial) subject to the most extinctions. Even though several mass extinctions have occurred, the focus is primarily on the larger identifiable organisms of the time, (Dinosaurs for example), especially those that have a fossil record proving they existed. This places the focus on complex plants and animals. Focus is often on man caused extinctions as well...which are, on the whole, a very small number in the grand scheme of the history of life on Earth. The primary concept to remember is that: Extinction is the rule, NOT the exception.
How many extinctions has earth experienced in its history?
Mass extinctions--at least two--one at the end of the Permian, and one at the end of the Cretaceous, with numerous other less severe events. As far as the extinction of individual species, that list would cover millions of extinct organisms.
What is an organism's physical appearance called by genetics?
False. An organisms physical appearance is its phenotype.
An organisms physical appearance or visible traits is its what?
Genotype
What do biologist NOT use to classify organisms?
appearance
What word is used to describe an organisms appearance?
genotype
