During the period 2.5–1.0 mya a. there was one widespread species of hominin, Homo erectus, with so much variation that early anthropologists thought there were several species existing side by side. b. several hominins, including but not limited to Homo erectus, Homo habilis, and various Australopithecine species, were alive at overlapping time periods, just as earlier periods saw several species of Australopithecine alive at once. c. there were two species of early hominin, Homo habilis living in Africa and Homo erectus living in Asia. d. the great diversity of hominins known from earlier periods was quickly trimmed down so only Homo erectus existed, alone, for most of that time.

The correct answer is B)

Explanation:

According to discovering made in relation to evolution, the Australopithecus Africanus (discovered in 1924), the Australopithecus Garhi  (discovered in 1990), and the Homo Habilis (discovered in 1960) all shared the same period - 2.5-1.0 MYA.

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.