Mice and Snakes.
Note that some lizards are secondary consumers and some are primary consumers (ex. Komodo Dragons are primary consumers)
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I think you forgot to give the options along with the question. i am answering the question based on my knowledge and research. "One group of bears was less highly evolved less than the two other groups and was destined to die out" is the one that explains why only one group of bears were extinct. I hope the answer has helped you.
Answer:
I think they involve swapping of one nucleotide for another during DNA repliction.For example during repliction,a thymine nucleotide might be inserted in place of guanine nucleotide
The answer is B) Limiting factors.
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