Recall that a carbon atom possesses four valence electrons, and oxygen atoms have six. Given this information, what is the MOST likely structural formula for carbon dioxide (CO2)?
a. O-C-O
b. O=C=O
c. O-C=O
d. O=C-O
Ans: b. O=C=O
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Some major changes that occurred in horse body size, foot anatomy and tooth morphology are hypothesized to be due to natural selection because of ...
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Answer the following statement true (T) or false (F)
Which animal phylum has an asymmetrical body plan?
a. Cnidaria b. Porifera c. Annelida d. Ctenophora e. Echinodermata