Select the correct statement about feedback regulation in endocrine systems. Select the correct statement about feedback regulation in endocrine systems.

a. All hormones are regulated by negative feedback loops.
b. A hormone cascade pathway involves the hypothalamus, posterior pituitary, and endocrine gland.
c. Some homeostatic control systems rely on pairs of negatively regulated hormone pathways, each counterbalancing the other.

B.

Explanation: Feedback regulation of endocrine system explains the hormone pathway in which neurons in the hypothalamus secreting thyroid releasing hormone, posterior pituitary and endocrine glands

C.

Explanation:

The response pathway for many hormones involves negative feedback, a loop in which response reduces the initial stimulus.

Whereas the positive feedback dampens the response like oxytocin and helps in better release of hormone required.

The negative and positive feedback have different functions. positive feedback reinforces the stimulus and response where as the negative feedback helps in maintaining and stabilizing  the existing affairs of the  state so that no external unwanted substance enters in the system.      

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]