It is a true statement that <span>David buss, an evolutionary theorist, has attributed the big five personality traits to evolved ancestral needs. The correct option among all the options that are given in the question is the first option. I hope that this is the answer that has actually come to your desired help.</span>
Neck length is what is going to change so that is the Independent Variable. The Dependent Variable is the Survival Rate.
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The correct answer is Protozoans.
Protozoans are best described as uni-celled eukaryotic organisms, both free-residing or parasitic, which feed on organic matter together with different microorganisms or organic tissues and particles. back then, the protozoa have been seemed as "one-celled animals," because they regularly possess animal-like behaviors, together with motility and predation, and lack a mobile wall, as discovered in plant life and plenty of algae.
From tiny blood cells/vessels!
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