Which piece of evidence BEST supports the "multiregional evolution" model of the evolution of modern humans?
A) Molecular clocks date the last common ancestor of modern humans to about 171,500 years ago.
B) Present-day human populations from Africa have greater genetic diversity than non-African populations.
C) African Homo ergaster/erectus appear almost simultaneously with Asian Homo erectus, 1.6 to 1.9 million years ago.
D) Both Asian fossil Homo erectus and modern Asian human populations show a high frequency of shovel-shaped incisors.
E) There is no solid evidence supporting the multiregional hypothesis.
D
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Air-breathing insects carry out gas exchange _____
A) in their specialized external gills B) in their specialized internal gills C) in the alveoli of their lungs D) across the finest branches of the trachea and cell membranes E) across all parts of their thin cuticular exoskeleton
About 80% of all land plants, including grasses, shrubs, and trees, form mycorrhizae. Mycorrhizae are best described as
A. parasitic associations between fungi and plant leaves. B. balanced competitive associations between plants and fungi. C. mutualistic associations between fungi and plant roots. D. parasitic associations between fungi and plant roots. E. mutualistic associations between fungi and plant leaves.
In humans, fiber does all of the following EXCEPT
A. provide energy. B. prevent constipation. C. help control weight gain. D. prevent hemorrhoids.
Substrate phosphorylation occurs when protons pass through ATP synthase and combine with oxygen to make water.
Answer the following statement true (T) or false (F)