I've checked all the options and I think that the right answer looks like this: Mollusks have highly developed olfactory receptors.
I think it’s C explanation : i learned this a while ago
He should raise his hand and wait for a teacher
Answer:

Explanation:
Mechanical advantage is given by the ratio of output force by input force.
= Output force = 
= Input force = 
So,

The mechanical advantage of the pulley's is
.
Answer:
I think it would be because In unicellular organisms such as bacteria, mitosis helps in asexual reproduction as it produces an identical copy of the parent cell. ... In the case of multicellular organisms, mitosis helps in growth and repair by producing more number of identical cells
Explanation: