What has to be true about available resources for competition to exist?

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

What is the role of dna ligase in the elongation of the lagging strand during dna replication?