Blood in arteries
1.always travels away from the heart.
2.travels away from the heart only if it is oxygen-rich.
3.always travels toward the heart.
4.travels from the lungs.
5.is always oxygen-rich.
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According to the multiregional model,
a. Homo erectus populations migrated out of Africa. b. Homo erectus evolved further in regions beyond Africa. c. Homo erectus populations gave rise to races of Homo sapiens. d. Homo sapiens subpopulations originated in several separate locations. e. all of these are true.
Explain why, after the Industrial Revolution in England, dark-coloured pepper moths became more abundant than the usual light-coloured moths, and why this case is often cited as an example of evolution by natural selection.
What will be an ideal response?
Mosses are an example of which of the following?
A. primary consumers B. detritovores C. decomposers D. autotrophs E. heterotrophs
What type of vaccine involves host synthesis of viral antigens?
A) conjugated vaccine B) subunit vaccine C) nucleic acid vaccine D) attenuated whole-agent vaccine E) toxoid vaccine