A biologist is studying how pollution affects algal growth and snail populations in a portion of Lake Erie. What level of organization is she studying?
a. population
b. community
c. ecosystem
d. cells
ecosystem
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Plant growth that elongates stems occurs in the:
A. shoot apical meristem. B. root apical meristem. C. shoot lateral meristem. D. root lateral meristem. E. internode.
Answer the following statements true (T) or false (F)
1, In insects, as in humans, the presence of a Y chromosome determines maleness. 2, If you were to examine a typical population at a single locus, you would find more copies of the wild-type allele than any other allele. 3, An individual with an SRY gene is a male mammal. 4, Only fathers can pass on pattern baldness to their sons.
True jellyfish belong to the class Scyphozoa of the phylum Cnidaria
Indicate whether the statement is true or false
Active phytochrome controls
a. flowering and seed set. b. seed germination. c. stem branching and elongation. d. expansion of leaves. e. all of these.