Question

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Answer 1

Answer:

1.More precisely, humus is the dark organic matter that forms in soil when dead plant and animal matter (including aerobic compost) breaks down further, specifically through the action of anaerobic organisms. Humus has many nutrients that improve the health of soil, nitrogen being the most important.

2.a) In humans, the excretory system consists of a pair of kidneys, a pair of ureters, urinary bladder and urethra. (b) Kidneys are two bean shaped organs lying at the back of the abdomen, one on either side of the vertebral column. Waste products from the blood and urine are removed by the kidney.

3.Vegetative propagation is an asexual method of plant reproduction that occurs in its leaves, roots and stem. This can occur through fragmentation and regeneration of specific vegetative parts of plants.

Explanation:

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Answer 2

Explanation:

(a)Humus - a substance made from dead leaves and plants, that you put into the ground to help plants grow.

(b)Excretory System -The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body.

(c)vegetative propagation -Vegetative reproduction is any form of asexual reproduction occurring in plants in which a new plant grows from a fragment of the parent plant or a specialized reproductive structure

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