So sánh sự khác nhau về quá trình tiêu hoá thức ăn ở động vật chưa có cơ quan tiêu hoá , động vật có túi tiêu hoá , động vật có ống tiêu hoá

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:

paper covers rock.

explanation:

rock only smashes scissors.