Describe the actions of parathyroid hormone dihydroxyvitamin calcitonin on the intestine.

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative