Geologists often need to know the age of material that they find. They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years. This is different to relative dating, which only puts geological events in time order.
3 examples would be touch, light and chemical.
and the most common signal would be chemical.
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Answer:
tropic hormones
Explanation:
Anterior pituitary is the anterior lobe of the pituitary gland (hypophysis). It is also called the adenohypophysis. The secretions of the adenohypophysis are involved in the contol of many biological fuunctions: growth, stress, reproduction etc. Two major groups of hormones from the adenohypophysis are:
- Tropic hormones-regulate the secretion of hormones from other endocrine organs (Thyroid-stimulating hormone-TSH, Adrenocorticotropic hormone ACTH, Luteinizing hormone LH, Follicle-stimulating hormone-FSH)
- Trophic hormones-regulate the growth (TSH-stimulates the growth of thyroid gland and ACTH which stimulates the growth of the adrenal cortex).
The Kidney does
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