Lymphocytes called __________________ secrete antibodies.
A. plasma cells
B. T cells
C. helper T cells
D. natural killer cells
Answer: A. plasma cells
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In acidic soils or in habitats subjected to prolonged acid rain, what element is often released from rocks that is toxic to many plants?
A. iron B. chlorine C. molybdenum D. selenium E. aluminum
Fossils of prokaryotic cells are dated as far back as approximately ________ billion years ago.
A. 2.8 B. 3.8 C. 1.5 D. 4.8
Why do snakes flick their tongue when they see potential prey?
A. They are trying to bring scent molecules into the mouth so the Jacobson's organs can decipher them. B. Snakes use tongue flicking as a means of communication. C. They are trying to detect the various scent molecules with their tongue. D. All of the choices are correct.
When organisms change their behavior to avoid competition, it is called ________.
What will be an ideal response?