Two individuals are members of the same species if they
a. possess the same number of chromosomes.
b. breed at the same time.
c. are phenotypically indistinguishable.
d. can mate and produce fertile offspring.
e. look alike.
D
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During the germinal period, the fertilized ovum duplicates and forms a blastocyst. This hollow ball of cells
a. fills the amnion with fluid b. develops a tail for movement c. contains the embryonic disk d. shrinks in size and is absorbed by the blood
By the process of ____, an organism's tissues store a pollutant taken up from the environment, causing the amount in the body to increase over time
a. pollutant fixation b. biological magnification c. chemical buildup d. pollutant concentration e. bioaccumulation
Which structure do numerous mollusks use to scrape algae off rocks?
a. chelicerae b. pupa c. radula d. beak e. shell
Possible genetic modifications that can cause epigenetic changes in gene expression include: (Select all that apply)
A. DNA methylation. B. histone variant localization. C. genomic imprinting. D. chromosomal inversion. E. mRNA degradation. F. histone acetylation. G. chromatin remodeling.