This topic contains a solution. Click here to go to the answer
|
Author Question: When did the first mammals appear? a. about 40 million years ago b. approximately 65 million ... (Read 69 times) |
Did you know?
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
Did you know?
The average adult has about 21 square feet of skin.
Did you know?
Approximately 25% of all reported medication errors result from some kind of name confusion.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.