An organism that regulates its temperature internally.
an organism that uses external sources of heat to regulate its temperature.
an organism whose internal temperature may vary considerably.
an organism that maintains a constant internal temperature.
a. endotherm
b. homeotherm
c. ectotherm
d. poikilotherm

An organism that regulates it's temperature internally is the Ectotherm

The answer is option B.

Explanation:

Humus is dull, natural material that structures in soil when plant and creature matter rots. At the point when plants drop leaves, twigs, and other material to the ground, it heaps up. This material is called leaf litter. At the point when creatures kick the bucket, their remaining parts add to the litter.Helps in enhancing tilth, air circulation and maintenance of dampness and expanding buffering and trade limit of soils . Humus is the natural material in soil.Humus contains numerous valuable supplements for solid soil,nitrogen being the most critical of all.