Genetic variation associated with meiosis is manifested as
a. new combinations of alleles due to crossing over.
b. random movement of homologous pairs of chromosomes moving to spindle poles.
c. random chance playing a role when a sperm fertilizes an egg.
d. diploid cells expressing various traits.
e. a, b, and c.
E
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Decomposers
a. are able to enter a food chain at any trophic level. b. are the most numerous organisms in an ecosystem. c. include bacteria and fungi. d. can occupy numerous habitats. e. all of these.
A heart attack occurs when cardiac cells receive an inadequate supply of ____
a. glucose b. calcium c. sodium d. oxygen e. potassium
In the ocean, swimming organisms that can move at will in the water column are referred to as
A) periphyton. B) zooplankton. C) megaplankton. D) nekton.
_____ are an example of seedless vascular plants.
a) Pine trees b) Mosses c) Charophyceans d) Ferns e) Lilacs