Answer:
I believe the answer is 7
There are 6 elements that are the most important. The acronym, CHNOPS, is an easy way to remember these.
C - Carbon
H - Hydrogen
N - Nitrogen
O - Oxygen
P - Phosphorous
S - Sulfur
from left to right they're vegetative propagation, budding, regeneration and pollination
The first one iss shrimp certain squid and fish