Diatoms tend to be grazed in temperate coastal waters by:
a. amphipods.
b. dinoflagellates.
c. copepods.
d. lobsters.
e. radiolarians
C
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Approximately what percentage of our planet's land area is covered by crop and pasture lands?
A. 25% B. 5% C. 10% D. 50% E. 60%
The ____ is a system of vesicles that wraps around each A band and I band
a. neuromuscular junction b. Golgi apparatus c. sheath d. microvillus e. sarcoplasmic reticulum
Which of the following characteristics are shared by all living organisms?
I. hereditary information is passed to offspring II. adaptation to environmental change III. requirement for nutrients IV. DNA housed in a nucleus
a. I and II b. I and III c. II and III d. I, II, and III e. I, II, III, and IV
Two species of toads have been successfully interbred in a laboratory but do not hybridize in nature because one species mates in summer and the other mates in the fall. This is an example of ____ isolation.
a. reproductive b. ecological c. inbred d. physical e. genetic