Please select the word in parentheses that fits the sentence: A catalyst [weakens/strengthens] the bonds of the reactants [increasing/decreasing] the activation energy.

Why do you think the puppy litter was all dark-haired?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?