An important food source for baleen whales are:
a. shrimp.
b. krill.
c. lobsters.
d. crabs.
e. horseshoe crabs.
B
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According to the ABC model of floral development, which genes would be expressed in a showy ornamental flower with multiple sepals and petals but no stamens or carpels?
A) A genes only B) B genes only C) C genes only D) A and B genes only E) A and C genes only
The part of the stem axis that extends above the cotyledons in some seedlings.
Choose the LETTER of the best match: A. hypocotyl B. endosperm C. scutellum D. radicle E. epicotyl
A cycle of biological activity that repeats around every 24 hours.
A. Circadian rhythm B. Photosynthesis C. Respiration D. Glycolysis E. Photorespiration
Which of the following lines of evidence suggest that mitochondria evolved from the endosymbiosis of a pre-eukaryotic cell with a prokaryote
A. they conation circular molecules of DNA B. they contain 70S ribosomes C. they divide independently from the cell D. all of these suggest