Acacia trees often have ants that live on them. The ants feed on materials produced by special structures called nectaries, which the tree produces. The ants will attack other animals that begin to feed on the tree and will even cut off small branches of other trees that come in contact with "their" tree. The relationship between Acacia trees and ants is called
A. mutualism.
B. competition.
C. predator/prey.
D. parasite/host.
A. mutualism.
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The structure depicted the accompanying figure shows the _____
A) 1-4 linkage of the ?-glucose monomers of starch B) 1-4 linkage of the ?-glucose monomers of cellulose C) double-helical structure of a DNA molecule D) ?-helix secondary structure of a polypeptide E) ?-pleated sheet secondary structure of a polypeptide
Parathion is effective and highly toxic to only about 5% of the human population
a. True b. False Indicate whether the statement is true or false
The rate at which evolution is occurring cannot be estimated by:
A. inferring that apes are related to humans. B. studying comparative anatomy. C. interpretation of the fossil record. D. measuring the degree of difference in genetic coding.
What initiates flowering in long-day plants?
A) nights shorter than a critical length B) nights longer than a critical length C) days longer than the nights that are in between them D) days shorter than a critical length