The brief length of time when mammals and birds learn the appearance of a parent is called:a
imprinting.
b. habituation.
c. classical conditioning.
d. operant conditioning.
e. insight learning.
a
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The central nervous system of a mammal includes the
(a) brain. (b) spinal cord. (c) brain and spinal cord. (d) brain, spinal cord, and every major nerve in the body.
Diatoms, coccolithophores and silicoflagellates all belong to the domain:
a. Eukarya. b. Eubacteria. c. Archaea. d. Anthophyta. e. Protista.
The 23 paired corresponding chromosomes, one from each parent are called ____
a. haploid pairs b. homologous chromosomes c. “n” pairs d. X and Y chromosomes e. sex chromosomes
Why is the runoff from fertilized agricultural fields, even if free of pesticides, often harmful to the ecosystems of temperate lakes?
A) Fertilizer compounds create large hydrothermal vent communities that kill lake organisms. B) The runoff causes heavy growth of algae, which eventually die and decompose, causing oxygen depletion. C) Runoff water pools at the lake's bottom, where the fertilizer compounds react with materials in the sediment to form toxic substances. D) The runoff is acid, and acidification kills key lake organisms.