Which animal group does not have tissues?
a. nematodes
b. sponges
c. echinoderms
d. flatworms
e. cnidarians
b
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In many soils there is more than enough phosphorus to support plant growth, but it is tightly bound to soil particles and thus largely unavailable. Which of the following are potential solutions to this problem for vascular plants?
(Select all correct answer options.) A. form symbiotic relationships with mycorrhizae B. form symbiotic relationships with bacteria C. pump H+ into the soil D. raise soil pH
Explain why radiation affects cancerous cells to a greater degree than noncancerous cells
What will be an ideal response?
Studies suggest that to become malignant, neoplasms must establish
a. contact inhibition. b. a blood supply. c. a nutrient source. d. a second genetic mutation. e. a mutation
Amino acids tend to diffuse from a blood capillary to the adjacent cell because
a. this is the only direction they can move b. the brain directs the movement into cells c. the cell needs the amino acids to make protein d. the concentration of amino acids is lower in the cell.