Where do Darwin stop on his voyage on the H.M.S. Beagle?
A. Australia
B. Africa
C. South America
D. All of the above
D. None of the above
D. All of the above
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The anterioposterior axis of an embryo is established by
A. activin. B. Hox genes. C. cadherins. D. noggin. E. transforming growth factor.
All functions in the sponge (gas exchange, circulation, and excretion) are performed by diffusion except which of the following?
a. sensory function b. glandular secretion c. digestion d. camouflage
This term is used to describe the fact that plants cycle between two different stages in their life, the diploid sporophyte and haploid gametophyte.
A. tropism B. sporulation C. alternation of generations D. germination
Phosphorus is an essential element in all living things and is a component of
A. ATP and DNA. B. most amino acids. C. nearly all vitamins. D. carbohydrates.