In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a diploid zygote; the other fuses with the central cell, forming a triploid cell.
Fill in the blank(s) with the appropriate word(s).
double fertilization
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Environmental stress can result from an inadequate supply of which of the following?
a. minerals b. sunlight c. water d. all of these
The greatest amount of nutrient absorption takes place in the:
a. stomach b. small intestine c. colon d. pancreas e. esophagus
Mesoderm gives rise to
A. epidermis. B. digestive tract. C. respiratory tube. D. peripheral nervous system. E. skeletal muscle.
All of the following are true about archaea except
A) They are prokaryotes. B) They lack peptidoglycan in their cell walls. C) Some are hyperthermophiles, some are extreme halophiles others are methanogens. D) They evolved before bacteria. E) Some produce methane from carbon dioxide and hydrogen.