Chloroplast are found in leaves because they absorb more sunlight which is needed for photosynthesis to produce food for the plant .
A, D, and not sure but maybe E
It assist organism in releasing carbon dioxide
There are 4 electrons altogether shared between carbon atoms in a molecule of C2H4, to be more precise there are 2 electron pairs shared between the carbon atoms.
The answer is C.
Chromosome are dark staining structures in a cell nucleus on which the organism genes (DNA Molecules) are arranged, -I.e Chromosome are the carriers of genes