Which mutation would change the greatest number of amino acids in a protein? A. a nucleotide is substituted for another in a proteins DNA sequence
B. a nucleotide is deleted from a proteins DNA sequence
C. a nucleotide is inserted into a proteins DNA sequence
D. an entire chromosome is added to a chromosome set

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

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine