What is the main reason that mammals underwent adaptive radiation after the demise of the dinosaurs?
A. The mammals had little competition so it was easier for them to evolve into the niches that were once occupied by the dinosaurs.
B. They had an "inner need" to become better suited to their environment.
C. They had to adapt in order to physically survive the ice age.
D. No answer choice is correct.
Answer: A
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The sum of all biosynthetic reactions in a cell is known as
A) metabolism. B) anabolism. C) catabolism. D) synthatabolism.
In a classic experiment, Otto Loewi stimulated the vagus nerve of a frog heart electrically. He let the fluid bathing the heart he was stimulating flow to and thus contact a second, nonstimulated heart. Both the first and second hearts slowed down with this stimulation. Based on this response, you can assume the nerve he stimulated was part of the
A. parasympathetic system. B. sympathetic system. C. somatic system. D. atrioventricular system. E. central nervous system.
Gnetophytes are different from other gymnosperms in that gnetophytes have vessel elements
____________________ Indicate whether the statement is true or false.
A(n) ________ is all of the species in an ecosystem that can interact in a geographic area
Fill in the blank(s) with correct word