25.Ở sinh vật sinh sản hữu tính qua giảm phân của quá trình phát sinh giao tử đực, mỗi tinh bào bậc một cho ra mấy tinh trùng ? (Mức 1) A) 4 tinh trùng C) 2 tinh trùng
B) 3 tinh trùng D) 1 tinh trùng

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.

i think its both a and b