The plant hormone that triggers the withering of petals and stamens and promotes fruit ripening is
A. abscisic acid.
B. ethylene.
C. jasmonic acid.
D. cytokinins.
E. gibberellins.
B. ethylene.
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Endotherms:
A. All of the answer options are correct. B. generate heat from the breakdown of food and other metabolic reactions. C. usually maintain a constant body temperature that is higher than that of their environment. D. include mammals and birds. E. have high metabolic rates.
The thick filaments of skeletal muscle ____
a. are composed of proteins with a double head and tail b. are composed of actin c. are attached to Z lines d. make up the light bands of the muscle e. are bead-like proteins
A infection derived from a hospital stay is classified as ____
a. epidemic b. pandemic c. endemic d. nosocomial e. maldemic
Novel phenotypic adaptations can arise as a result of changes only in how organisms develop.
Answer the following statement true (T) or false (F)