Which materials typically make up the a horizon in soil?

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time