The malarial stage infecting red blood cells of humans are the:
A. merozoites
B. sporozoites
C. saprophytes
D. gametocytes
E. neophytes
A. merozoites
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Describe how and why some species of nudibranchs use the stinging nematocysts of cnidarians
What will be an ideal response?
The pulmonary valve ____
a. controls blood flow through the pulmonary artery b. lies between the left ventricle and the lungs c. is anchored by chordae tendineae d. closes when the ventricle contracts e. is also known as the mitral valve
In flowering plants, eggs are to ovules as
A) sperm are to pollen. B) sperm are to anthers. C) pollen is to carpels. D) pollen is to sepals.
Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three- to five-year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?
A) Periodic crowding affects the endocrine system, resulting in increased aggressiveness. B) Increases in population density lead to increased rates of predation. C) Increases in rates of herbivory lead to changes in the nutritive value of plants used as food. D) Increases in population density lead to more proximal infestations of parasites to host animals. E) All of the above are plausible explanations of population cycling.