Explanation

Explanation

Biogas produced as a result of anaerobic decay of organic matter consists primarily of methane (CH4) and carbon dioxide (CO2).

Biogas can also contain small amounts of other gases, such as:

• Water vapor
• Hydrogen sulfide (H2S
• Siloxanes

Explanation

The biogenetic law, also known as recapitulation theory, was proposed by Ernst Haeckel.

It suggests that the development of an organism (ontogeny) mirrors the evolutionary development of the species (phylogeny).

Explanation

Vitamin C is essential for collagen synthesis.

It acts as a cofactor for the enzymes involved in stabilizing and cross-linking collagen fibers

Which are vital for the structure of skin, blood vessels, and other connective tissues.

Explanation

Eggs are considered a complete protein source,

They contain all the essential amino acids needed by the human body

A single egg can provide around 6-7 grams of protein. 

Banana:

A medium banana contains approximately 1 gram of protein. 

Apple:

Apples are very low in protein, containing only about 0.5 grams per serving. 

Cucumber:

Cucumbers are also extremely low in protein, with only around 0.3 grams per serving

Explanation

The number of bioelements considered vital for life is 16. These essential elements include:

1. Carbon (C)
2. Hydrogen (H)
3. Oxygen (O)
4. Nitrogen (N)
5. Phosphorus (P)
6. Sulfur (S)
7. Potassium (K)
8. Calcium (Ca)
9. Magnesium (Mg)
10. Iron (Fe)
11. Sodium (Na)
12. Chlorine (Cl)
13. Copper (Cu)
14. Zinc (Zn)
15. Manganese (Mn)
16. Iodine (I)

Explanation

Decomposers like bacteria and fungi break down dead plants and animals.

This process recycles nutrients back into the soil, supporting new plant growth.

Explanation

Explanation

Eukaryotic cells have a well-defined nucleus enclosed by a nuclear membrane.

Prokaryotic cells lack a nucleus — their DNA floats freely in the cytoplasm.

This is the main difference between the two.

Explanation

Children aged 12 to 14 years typically need 2000–2400 calories daily, depending on gender and activity level.

This supports their growth, development, and energy needs.