B: polymer, <span>Polymer is a greek word which means many pieces (polla meri). By definition it's a macromolecule (long molecule) which has been created by the reaction of many molecules called monomers. </span>
<em>water is important because it gives space to the substances to get in it also it makes the substances wet and dissolve the gases in it ,to transport them from one place to another... </em>
Spontaneous generation is an abandoned thought.
Cell theory states that:
1. Cells came from pre-existing cells
2. Cells are the basic unit of life
3. All life is composed of cell/s
More:
<span>The cellular organization relates with one another since the colossal cell, the organ system is fundamentally composed of cells. Cells are the building blocks of these structures and which creates such organ and organ system. They associate as one cell intercommunicates with another cell until all received the message and translates it and sends it with another organ and to cell -vice-versa. And also, they become interdependent with the other cell -other tissue -other organs -other organ system.<span>
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Answer:
A. The appearance of complex, multicellular animals
Explanation:
Precambrian period is the earliest period in the history of the earth. It was characterized by different evolutionary characteristics and differences.
The end of this period was marked with The appearance of complex, multicellular animals which were able to perform complex tasks
Crust, core, atmosphere, and earth carries away rock hits.