2 is correct all animals have a similar goal is survive and reproduce
<span>Unidirectional flow in the heart is ensured because the heart contains valves that prevent backflow.
These valves keep the flow of the heart going in one direction (hence the name "unidirectional").</span>
<span>Alfred Wegener first proposed the theory
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The transmission of antibiotic resistance, toxicity, and allergenicity are all known to be major health risks associated with GM foods.
D It all depends on dna, who, how, were, etc. Heredity
