Answer: b and c
Explanation:
B. Can vary force of contraction.
C. By varying calcium entering the cell.
Answer: OC) color blindness
Explenation: Malaria and flu arent genetic, they are enviormental. And in most cases down syndrome isn't inherited by only one parent.
The correct answer is option d. its absence would affect many organism present in the community.
The keystone species are the one, who play a very important role in the ecosystem. In case, the keystone species is wiped off from a particular ecosystem, then the function of the ecosystem would cease and lead to a major effect. Hence, the keystone species is very important for the survival of ecosystem.
Answer:
C
Explanation:
Experiments can be done to prove whether it is true or not.
d, planarians avoid light
