Groundwater is recharged naturally by rain and snow melt , hope this helps :)
<span>There are three major groups of mammals, categorized on the basis of their method of reproduction. Monotremes lay eggs to have children instead of having the mother bear them. The second type of mammal is the marsupial, which are non-placental animals who carry their young in their pouches. Eutherians are the third group who are placental mammals.</span>
Answer:
Sexual repro means combining genetics from parents, while asexual repro produces an offspring from only one parent.
Answer:
They might gain or lose weight quickly, unexpectedly, and with no explanation unless thyroid is tested. Some of the symptoms that can occur with metabolic disorders are lethargy, jaundice and seizures. The symptoms expressed would vary with the type of metabolic disorder, mostly calcium metabolic disorders. Increased blood pressure, high blood sugar, excess body fat around the waist.

Saliva contains Salivary Amylase, which helps in breakdown of sugar.
So, correct choice is (a) Amylase.