What are the major limiting factors that determine the distribution of organisms in aquatic ecosystems?
A) Light and nutrients
B) Appropriate temperatures and excess water
C) Excess water and nutrients
D) Light and excess water
E) Availability of water and appropriate temperatures
A
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The physical appearance and physiology of an organism, resulting from interactions of its genetic makeup and its environment, is its
(a) phenotype. (b) hybrid vigor. (c) dominance. (d) genotype.
Which of the following complicates the generation of an evolutionary tree?
A. vertical gene transfer B. linkage analysis C. changes in mitochondrial DNA D. carcinogens in the environment E. multiple birth (e.g., twins)
Which element is considered an essential micronutrient for plants?
a. calcium
b. lithium c. sulfur d. nickel e. oxygen
The human knee-jerk reflex requires an intact _____
A) spinal cord B) corpus callosum C) cerebellum D) medulla