Stickleback evolution lab final quiz 2. what happened to these fish as they adapted to living exclusively in fresh water? over many generations, populations of fish changed in many different ways, including in their skeletons. they acquired new characteristics by mating with fish that lived in these lakes. since the new environments were so similar to their old environments, their traits changed. the new environments caused individual fish to change within their lifetime.

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15 ! come and answer! a(n) disease is caused by a pathogen and can spread among organisms. a infectious b noninfectious c toxic d contaminated

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.