Which statements are true about molecules? Select all that apply. They always contain only one type of atom.
They are a group of atoms that are strongly joined.
They are the smallest unit of an element or a compound.
They always contain different types of atoms.

option a and d is the correct answer

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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 answer is a) cell division.

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c. heat from the poles back down towards the equator.