Which of the following does NOT occur in the
first trimester during human development?
a. formation of a heart
b. disappearance of the tail
c. formation of internal organs
d. detection of movement of the fetus
e. segmentation and development of somites
D
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Squirrels tend to have larger body sizes at higher latitudes. This could be an example of
A) acclimation. B) positive assortative mating. C) a cline. D) the Hardy-Weinberg principle.
The outward expression of an organism's genotype is referred to as its genotype.
Answer the following statement true (T) or false (F)
In plant cells, what provides cellular support and protects cells from pathogens?
a. the cell wall b. the cell membrane c. the cytoplasm d. the plasmodesmata
How are comparisons of the number of base substitutions at nonsynonymous sites between genes encoding homologous proteins in different species or in different members of a gene family used to construct a molecular clock?
What will be an ideal response?