In flowering plants, male gametophytes are also known as ________, which develop from microspores.
A. embryo sacs
B. anthers
C. megaspores
D. pollen grains
Answer: D
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Changes that have occurred in living organisms over the past four billion years are due primarily to
A. extinction of species. B. continental drift. C. changes in geological periods. D. interaction of genetic changes and environmental changes. E. the change in the orbit of the moon, causing mass extinction due to volcanic activity.
The union of a sperm and egg is called
A. implantation. B. cleavage. C. fertilization. D. mitosis.
After you drink a glass of acidic lemonade, your body's pH does not change. This is an example of how humans and other organisms
A) evolve in response to the environment. B) maintain precise internal conditions through homeostasis. C) are immune to weak acids. D) maintain cellular organization.
What are the smallest projections of the small intestine wall?
A. Microvilli B. Cilia C. Villi D. Brush border cells E. Duodena