How do epithelial cells obtain their nutrients?
a. Direct blood supply from an artery
b. Nutrients are delivered by macrophages.
c. Direct blood supply from a vein.
d. Diffusion from adjacent cells.
e. Osmosis of nutrients from underlying tissue.
d
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Earth's axis is tilted away from the sun during ________ and toward the sun during ________ in the Northern Hemisphere
A) winter; summer B) summer; winter C) spring; fall D) fall; spring
Which factor may result in the actual carrying capacity of our planet being lower than initially calculated?
A) The average American uses more resources than someone from another country. B) Modern food production relies on nonrenewable resources. C) NPP has been decreasing. D) The human population is growing much faster than was previously thought.
Asexual reproduction in flowering plants does not usually involve the formation of:
a. plantlets, stolons, or seeds. b. suckers, corms, or rhizomes. c. flowers, seeds, or fruits. d. bulbs, rhizomes, or seeds. e. flowers, bulbs, or stolons.
An organic molecule with the chemical formula C4H5O1N3 is probably a pyrimidine.
Answer the following statement true (T) or false (F)