Hormones that are secreted by one endocrine gland (i. e., anterior pituitary gland) and control the secretion of a hormone from another endocrine gland (i. e., adrenal gland) are generally called hormones. A. tropic
B. glucocorticoid
C. activation
D. blood releasing

A. tropic

Explanation:

Generally, hormones are chemical messengers that are secreted in a particular location and transported to another location to effect a physiological response. However, some set of hormones secreted by an endocrine gland functions in stimulating or regulating the secretion of other hormones by another endocrine gland. These group of hormones are called TROPIC HORMONES.

As stated in this question, the anterior pituitary gland, which is considered to be the "MASTER GLAND" secretes an hormone that controls the secretion of another hormone by adrenal gland. The hormone secreted by the PITUITARY GLAND is a TROPIC HORMONE. An example of tropic hormone is ADRENOCORTICOTROPIC HORMONE (ACTH) secreted by anterior pituitary gland.

most community's take hundreds of years to become stable

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.