Which term describes a steady state in which the internal conditions of an organism are kept within a narrow range without regard to the external conditions?
a. regulatory homeostasis.
b. negative feedback.
c. conformational homeostasis.
d. thermoregulation.

The correct answer is A. Regulatory homeostasis

Explanation:

In regulatory homeostasis, the internal condition of an organism remains within a narrow range irrespective of the external environment condition. This steady-state is necessary for the cell to live and perform important metabolic functions.

Some of the regulatory homeostasis performed by the body is maintaining pH of the blood, ionic balance in the cell, temperature of the body, blood sugar level, etc.  

Negative feedback loop is involved when homeostasis is performed for example if the pH of blood increased the this negative feedback loop will function and bring back the pH at normal value. So the right answer is A.

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1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.