In order for a new species to be established from a previous species,
A. there must be genetic differences between the two groups.
B. the two groups must have similar habitat requirements.
C. they must live in different places.
D. All of these answers are true.
A. there must be genetic differences between the two groups.
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The umbilical cord functions to
(a) carry waste products in the blood from the fetus to the mother. (b) carry waste products in the blood from the mother to the fetus. (c) carry oxygen in the blood from the mother to the fetus. (d) do both a and c.
Substances that alter sensory perception, cause
disorientation, and inhibit the ability to perform complex tasks are a. depressants. b. stimulants. c. analgesics. d. hallucinogens. e. antipsychotics.
Mechanoreceptors are located in
a. internal organs. b. skin. c. joints. d. tendons. e. all of these.
In their experiments to identify the transforming principle, Avery, MacLeod, and McCarty used enzymes that break
down ____.
a. protein, DNA, and RNA b. protein and RNA only c. DNA only d. protein, lipids, and RNA
e. lipids and DNA only