A change in the nucleotide sequence is known as a . These errors may be caused when enzymes fail to "proofread "properly, or they may e cause by outside sources such as .

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

What is the ecological role of food chains and food webs

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?