Enzymes are a type of protein found in cells. they catalyze biochemical reactions that are essential for cellular function each type
of enzyme has a unique structure that is different from every other enzyme. how does this enzymes perform their function?
a. it allows enzymes to change their form based on a given substrate
b. it ensures that all enzymes bind to the same substrate,
c. it allows each enzyme to catalyze multiple reactions
d. it ensures that enzymes only bind to specific substrates

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

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.

Ture or false evidence for evolution includes millions of fossils