Which of the following was a biological fact important to the development of Darwin's ideas about evolution?
A. Organisms typically produce huge numbers of offspring.
B. There are differences among members of the same species.
C. There is a high death rate among organisms.
D. All of these are true.
D. All of these are true.
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Why are mycorrhizal fungi superior to plants at acquiring mineral nutrition from the soil?
A) Hyphae are one hundred to one thousand times larger than plant roots. B) Hyphae have a smaller surface-area-to-volume ratio than do the hairs on a plant root. C) Mycelia are able to grow in the direction of food. D) Fungi secrete extracellular enzymes that can break down large molecules.
Condoms are _________.
Condoms are _________. (Check all that are true) [A] attached using a strong adhesive [B] worn for up to one week [C] a way to prevent STDs [D] safe, effective, and easy to obtain
The current extinction rate of vertebrates is 100–1,000 times the historical background. This is primarily due to
A. overharvesting. B. competition with exotic species. C. habitat destruction. D. competition with native species. E. random chance.
Members of what group are multicellular producers?
a. Animalia b. Protista c. Fungi d. Plantae e. none of these