Which of the following statements is true?
the main factors determining biome conditions are wind and soil type.
a niche is the role an organism has in an ecosystem.
the number of organisms in an ecosystem is an abiotic factor.
biomes generally follow man-made boundaries, like country borders.

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.