Why do i have erectile dysfunction?
a. because of b
b. because of c
c. because of d
d. none of the above
e. all of the above except a-d

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

One of the reasons that stars are so large is because

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?