Scientists believe that a major factor promoting the adaptive radiation of mammals was probably
a. their development of fur
b. the mass extinctions of most dinosaurs, an event that opened up new ecological niches
c. internal fertilization
d. their tetrapods body plans, which gave mammals new capabilities
e. the origin and diversification of flowering plants
Ans: b. the mass extinctions of most dinosaurs, an event that opened up new ecological niches
You might also like to view...
Why do antibiotics not harm human cells?
What will be an ideal response?
The template for RNA polymerase is ________, and the new RNA chain is ________ to the template
A) an independent RNA segment / parallel and identical B) DNA / antiparallel and complementary C) an independent RNA segment / antiparallel and complementary D) DNA / parallel and identical
To introduce recombinant vectors into coli, cells are usually
1.transduced. 2.conjugated. 3.transformed. 4.ligated. 5.expose to a restriction enzyme.
Which of the following is not true of all cells?
A) They assimilate nutrients. B) They are attached by gap junctions to remain in place. C) They eliminate wastes. D) They synthesize new cellular material. E) They arise from other living cells.