Our own species, __________, appears to have evolved in Africa less than 200,000 years ago.  

A.  Homo habilis
B.  Homo erectus
C.  Homo sapiens
D.  Homo hominis
E.  Homo australopithecus


C.  Homo sapiens

Biology & Microbiology

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Matter is gained or lost in ecosystems. How does this occur?

A) Chemoautotrophic organisms can convert matter to energy. B) Matter can be moved from one ecosystem to another. C) Photosynthetic organisms convert solar energy to sugars. D) Detritivores convert matter to energy. E) Heterotrophs convert heat to energy.

Biology & Microbiology

A water-vascular system that operates the tube feet is characteristic of the ____

a. arthropods b. annelids c. chordates d. mollusks e. echinoderms

Biology & Microbiology

In the skeletal muscle cells of vertebrates, as many as ____ ATP molecules are produced from one molecule of

glucose, which is less than might be expected because electrons from NADH produced during glycolysis must be shuttled through the ____ mitochondrial membrane at a cost. a. 2; outer b. 2; inner c. 6; outer d. 36; inner e. 38; inner

Biology & Microbiology

Natural and synthetic angiongenesis inhibitors are being studied with the idea that molecules will increase the growth of tumor

a. true b. false

Biology & Microbiology