The two structures that could be found only in plant cells are chloroplast and the cell wall. As these two structures are not present in the animal cells, therefore the chloroplast and cell wall are the two positive identifications of a plant cell under the microscope.
Answer:
b
Explanation:
because the green plants need light or the cell division for it to work.
each carbon atom can form up to four covalent bonds with a wide variety of bond angles.
When carbon forms covalent bonds with four other atoms, they are arranged at the corners of an imaginary tetrahedron with bond angles near 109o.
When two carbon atoms are joined by a double bond, all bonds around the carbons are in the same plane.
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