Small cells function more effectively, because as cells become larger their surface area to volume ratio:
A. stays the same.
B. is cubed.
C. decreases.
D. increases.
E. is squared.
Answer: C
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If populations within the same area split into species, the process is known as
A. allopatric speciation. B. reproductive speciation. C. racial speciation. D. ecotypical speciation. E. sympatric speciation.
In addition to autosomes, what is contained in a human sperm cell?
A) an X chromosome always B) either an X or a Y chromosome C) a Y chromosome always D) both an X and a Y chromosome
A Malpighian tubule is a(n) ____
a. rasping tongue with chitinous teeth b. muscular sac used for extending tube feet in echinoderms c. filamentous projection of the mantle d. specialized tube in some arthropods used for waste processing e. abdominal appendage in some arthropods that secretes silk
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.
When you compare Australian marsupials to placental mammals today
A. the marsupial fossils look remarkably similar to the placental mammals of today. B. the marsupials are all very primitive, having changed very little during the last 70 million years. C. the marsupials are very similar to placental mammals in the ways they have adapted to similar ecological niches. D. living marsupials are little changed from the earliest marsupial fossil forms. E. the marsupials have evolved much more rapidly than placental mammals and are more highly adapted.