Where in the world does most deforestation occur?

a. the taiga in Siberia
b. the boreal forest in Canada
c. the tropical rainforest in Africa
d. the tropical rainforest in South America
e. the temperate rainforest in North America


ANSWER: d

Biology & Microbiology

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Which of the following domains consists of organisms whose cells lack nuclei?

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Activation energy is best described as ________

a. the difference in the energy level of the reactants and the energy level of the products b. the minimum amount of energy it takes to get a reaction started c. the proportion of the energy released by an endergonic reaction that can be captured by ATP d. the minimum amount of energy a reaction produces once it gets started

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The Lotka-Volterra models used for competition may also be used to describe the dynamics of a mutualism by replacing the competition coefficients with positive interaction coefficients

Indicate whether the statement is true or false

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What is the role of B cell receptors (BCRs) and T cell receptors (TCRs) in the immune response?

A) to release chemicals which destroy pathogens B) to recognize specific epitopes of an antigen C) to combine with haptens so they can stimulate an immune response D) to communicate with lymphocytes and other white blood cells E) to release the cytokines needs for immune cell stimulation

Biology & Microbiology