"your friend is trying to learn about how to kill bacteria. she reads that preservatives such as citric acid are added to foods because the acidic environment kills bacteria by denaturing their proteins. since you are taking a biology class, she asks you what it means. how can you explain it in simpler terms? "

An example of what is geese flying south for the

Which of the following statements is true? a. the main cause for speciation is an increase in gene flow. b. organisms that reproduce asexually are not considered part of a species. c. on a tree of life diagram, speciation is shown by the merging of two different lineages. d.the size of the geographic area inhabited by a population can cause speciation.

What are two reasons for why a species might disappear from the fossil record?