e. Australopithecus afarensis 16 The distribution of ancient hominins older than
ID: 3166591 • Letter: E
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e. Australopithecus afarensis 16 The distribution of ancient hominins older than the gems Homo suggests that- a. They evolved in rain forest. b. They lived in habitats that experienced major, unpredictable environmental change c. They were likely primarily fruit eaters d. They competed with chimpanzees for habitat and won e. They competed with chimpanzees for habitat and lost 17. The increasing prevalence of breast cancer as humans age is likely due to : a. The requirement for breast growth in young women b. Increasing rates of mutation in older adults c. The origin of cancer promoter genes as cell growth promoters d. weak selection against mutations in growth regulator genes after menopause e. A tradeoff between successful reproduction and increased susceptibility to cancerExplanation / Answer
16 - The detribution of aneint hominins older than genus Homo :
- They lives in habitats that experianced major, unpredictable enviromental change.
- The word "hominid" in this website refers to members of the family of humans, Hominidae, which consists of all species on our side of the last common ancestor of humans and living apes.
- Hominids are included in the superfamily of all apes, the Hominoidea, the members of which are called hominoids.
- Although the hominid fossil record is far from complete, and the evidence is often fragmentary, there is enough to give a good outline of the evolutionary history of humans.
- The time of the split between humans and living apes used to be thought to have occurred 15 to 20 million years ago, or even up to 30 or 40 million years ago.
- Some apes occurring within that time period, such as Ramapithecus, used to be considered as hominids, and possible ancestors of humans.
- They exploited more types of environments.
- Their early proto-hominin ancestors had been predominantly tropical forest animals.
- However, African forests were progressively giving way to sparse woodlands and dry grasslands, or savannas.
- The australopithecines took advantage of these new conditions.
- In the more open environments, bipedalism would very likely have been an advantage.
17 - Increasing prevalence of breast cancer as humans age is likey due to :
- Increasing rate of mutation in older adults.
- The older a woman is, the more likely she is to get breast cancer.
- Rates of breast cancer are low in women under 40. Fewer than 5 percent of women diagnosed with breast cancer in the U.S. are younger than 40.
- Rates begin to increase after age 40 and are highest in women over age 70.
- The older a man is, the more likely he is to get breast cancer.
- However, breast cancer is much less common in men than in women.
- The older we get, the more likely it is abnormal changes will occur in our cells. When many of these changes occur, cancer can develop.
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