Coral reefs are highly productive and diverse ecosystems because :
A) they have high turnover rates with high polyp production.
B) corals produce limestone skeletons that create habitats for many ocean species.
C) they are composed of polyps that live in and are adapted to warm, shallow tropical waters with high nutrient availability.
D) they are made of limestone that supports many species of zooplankton with high productivity.
Answer: B
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The purpose(s) of two circuits in a closed circulatory system is to ____
a. collect and distribute blood within the heart b. take blood to and from all parts of the body c. take blood to and from the lungs d. keep oxygenated and deoxygenated blood separate e. allow oxygenated and deoxygenated blood to mix
Abscisic acid promotes bud and seed __________, and it limits water loss by promoting stomatal
closure. Fill in the blank(s) with the appropriate word(s).
What property defines most ligands for intracellular receptors?
A. They are hydrophilic B. They are large molecules C. They are molecules that can perform significant hydrogen bonding interactions with water D. They are lipid-soluble
If two otherwise dissimilar organisms share similar genomic DNA, to what would you attribute the genomic similarity?
A. The shared genes are ancient and probably no longer function within the altered physiological states of modern organisms. B. The two taxa are more closely related than formerly believed. C. The shared genes developed early in evolution and are likely to be applicable to a wide diversity of organisms. D. DNA is not a reliable basis for phylogenetic decisions. E. The shared genes have evolved a number of times and have no phylogenetic significance.