What do veins have that arteries and capillaries do not?

a. valves
b. skin cells
c. extra thick
d. chambers

light dependent reactions:

light independent reactions:

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her affection for her parents makes her an especially sympathetic character.

linnaeus is the father of taxonomy

explanation:

which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.