During the period 2.5–1.0 mya a. there was one widespread species of hominin, Homo erectus, with so much variation that early an
thropologists 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.
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.
In a closed circulatory system is the one in which the blood is circulated to all the parts of the body of the organism through vessels of different length and width. In this system the blood is pumped from the heart through blood vessels where it is transported to different organs and cells of the body instead of filling up the body cavity.
<h3><em>Water that can be extracted easily from foods by squeezing or cutting or pressing is known as free water, whereas water that cannot be extracted easily is termed as bound water.</em></h3>
