In the water cycle, animals return water to the environment by
A. transpiration and excretion.
B. excretion.
C. transpiration.
D. evaporation and excretion.
E. evaporation.
B. excretion.
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Given that T cell receptors (TCRs) are randomly generated during the maturation process, how are new T cells selected that can recognize self-antigens and other immune cells appropriately?
What will be an ideal response?
Cnidarians capture their prey with the use of
a. poison claws. b. nematocysts. c. oral teeth. d. pedal disks.
In prokaryotes, an _____ is a group of gene that are regulated together.
Fill in the blank(s) with the appropriate word(s).
Compared to the sunflowers, birch trees are:
A. r-selected. B. K-selected. C. less competitive. D. All of the responses are correct. E. None of the responses is correct.