The living jawless fish are the
a. lampreys and sharks
b. sharks and rays
c. hagfishes and coelacanths
d. lampreys and hagfishes

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

i believe the answer is snake.