________ lakes are nutrient-rich and tend to have large populations of algae.
A. Eutrophic
B. Temperate
C. Stratified
D. Oligotrophic
Answer: A
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Hemoglobin helps maintain the oxygen pressure gradient by ____
a. carrying oxygen away from the lungs b. carrying carbon dioxide away from the lungs c. releasing oxygen at the lungs d. releasing carbon dioxide at the tissue e. releasing oxygen into the alveoli
Root hairs absorb nutrients from soil against the nutrient concentration gradient. To achieve this, root hairs use _____.
A. proton pumps B. facilitated diffusion C. direct diffusion D. osmosis
Which of the following kinds of protozoa are major consumers of Bacteria and other microorganisms in the ocean?
A. Apicomplexa B. Foranimifera C. Dinoflagellates D. Thermophiles
A fruit is a
A) seed. B) mature ovule. C) plant embryo. D) female gametophyte. E) mature ovary.