What variable means factors in an experiment that remain the same

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.

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

Which feature of a human community is similar to a niche in a biological community