Placental mammals give birth to more fully developed offspring than marsupial mammals and therefore have a greater chance of survival. This helps to explain why placental mammals from North America displaced many native South American marsupial mammals when a land bridge formed between the two continents.
a. true
b. false
Answer: a. true
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According to the fossil record, tetrapods arose from ____
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
One of the pyrimidine bases in a DNA molecule is adenine
__________________ Indicate whether the statement is true or false.
Each homeobox codes for a protein functional region that binds to a specific DNA sequence and
thereby affects translation. Indicate whether the statement is true or false.
Which of the following statements is NOT true about the life cycle of flowering plants?
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