Which of the following explains why fewer animals live in freshwater than in the ocean?
a. Freshwater is turbulent.
b. Freshwater generally contains less food.
c. Freshwater maintains a constant oxygen content.
d. Freshwater is generally hypotonic to tissue fluids.
e. Freshwater temperatures do not fluctuate much.
d
Biology & Microbiology
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All of the following are second messengers except
A) calcium ions. B) IP3. C) DAG. D) cameleons. E) PDGF.
Biology & Microbiology
Chemical bonds are based on attractions
between the ____ of two atoms.
a. electrons and protons b. protons c. protons and neutrons d. electrons e. neutrons
Biology & Microbiology
List the stages of interphase and the events that occur during each of these stages.
What will be an ideal response?
Biology & Microbiology
If a blood vessel has valves, it is probably
a. a vein b. an artery c. a venule d. part of the lymphatic system
Biology & Microbiology