Which of these layers is the deepest?

a. b horizon
b. c horizon
c. o horizon
d. a horizon

Answerseafloor spreading;

The correct answer is:   [b]:   "physical systems" .

It would be tomatoes i believe

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.