Aperson with blood type o would
a. lack both antigens a and b on their erythrocytes.
b. are universal recipients.
c. possess neither anti-a nor anti-b antibodies circulating in their blood plasma.
d. possess both a and b on their erythrocytes.

Which of the following typically characterizes a tropical rainforests

True or false multiple lane changes must be done individually going through the same procedures for each lane change

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.