Which of these would most likely contribute to the extinction of a species?
a. an increase in its genetic variability
b. a decrease in the number of its competitors
c. the extinction of species at higher trophic levels
d. the extinction of species at lower trophic levels

Which of the following is a cause of a dna mutation? o a. the linking of amino acid subunits into a long chain o b. the transcription of dna into rna o c. an error in the repair of damaged dna d. the diffusion of molecules across the cell membrane submit

Which statement about inheritance is true? o girls get most of their traits from their moms, boys get most of their traits from their dads. o male offspring will always have an x-linked genetic disease if the mom is a carrier o fathers always determine the gender of the offspring in humans. o males never have y chromosomes.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?