A(n) ________ model of community structure assumes that the presence and absence of individual species in a community result from independent responses to the physical environment and interactions among species have no impact on community structure
Fill in the blank(s) with correct word
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As recently as the 1980s, the medical establishment believed ulcers to be caused by stress and an increase in gastric acidity. How has the current understanding of ulcer development changed patient treatment?
A. There is no treatment for ulcers, then or now. B. Antibiotics are now used to treat ulcers. C. Different foods are now suggested for patients having ulcers. D. Doctors now give their patients sedatives to calm patients with ulcers.
In the process of double fertilization, one sperm fuses with the egg and the other sperm fuses with a spore
____________________ Indicate whether the statement is true or false.
Pertussis has the following characteristics, except
What will be an ideal response?
The polysaccharides agarose and carrageenan are isolated from red algae for commercial use. These polysaccharides are found in cell walls. What plant polysaccharide are they analogous to?
A. Elastin B. Mannose C. Amylose D. Collagen E. Cellulose