Which of the following describes a positive feedback loop? When blood sugar concentration is too low, the endocrine system secretes hormones that increase blood sugar concentration to a normal level.

When the body senses that the heart rate is very high, it secretes hormones that decrease the heart rate.

When blood sugar concentration is too high, the endocrine system secretes hormones that decrease blood sugar concentration to a normal level.

When someone is exercising intensely, the body secretes hormones that increase oxygen supply for cellular respiration.

answer; i believe the correct answer is (replication is not conservative);

just here for the other one bc they put up with u

because the light is a great source of energy for the plants to survive. (i hope this )

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.