Which of the following statements are true about natural selection? (fitness is defined as -- inherited characteristics that increases an organisms chance of survival)
a. it selects traits that increase fitness b. it takes place without human control c. it can be observed directly in nature d. it leads to an increase in a species' fitness a a only b a and b only c c only d a, b and c only

and plz !

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

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?