As animals move up in the food chain they start to have larger competition for food with other animals, deer compete with elk and even rodents that eat the same food as them. They must fight for food and survival.
Your answer is actually all correct. Great job! A heterozygous combination would just implicate greater power to the 'dominant' dominant allele.
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golgi tendon and muscle spindle
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The advantage of this is that there is a larger surface area exposed, more time available and shorter difference for exchange of oxygen.
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