Explanation

Genes are the smallest functional units of hereditary material found on chromosomes.

Genes are made up of DNA.

Explanation

The biosphere is made up of the parts of Earth where life exists—all ecosystems. 

The biosphere is defined as the region on, above, and below the Earth's surface

The biosphere is a zone on the surface of the earth where soil, water, and air combine to sustain life.

Life can only occur in this zone

ND-21-5-2023

Explanation

Metallic bonds are the force of attraction between positive metal ions and valence electrons that are constantly moving around them.

Metallic bonds occur among metal atoms.

Whereas ionic bonds join metals to non-metals,

metallic bonding joins a bulk of metal atoms.

A sheet of aluminum foil and a copper wire are both places where you can see metallic bonding in action.

ND-21-5-2023

Explanation

Smelting uses heat and a chemical-reducing agent to decompose the ore,

driving off other elements as gases or slag

and leaving the metal base behind.

Smelting is a method used in the extraction of metals that involves heating the metal oxide produced from roasting with a reducing agent, such as carbon, to obtain pure metal.

ND-21-5-2023

Explanation

Number of moons in the planets

Saturn: 83

Jupiter: 92

Uranus: 27

Neptune: 14

Mars: 2

Earth: 1

Venus: 0

Mercury: 0

Explanation

When fossil fuels are burned,

they release large amounts of carbon dioxide,

a greenhouse gas, into the air

.ND18-5-2023

Explanation

Bioclimatology is the correct answer.

Bioclimatology is the study of the relationship between climate and living organisms.

It is palaeoclimatology...

AGM 28.02.28

Explanation

It is a highly unstable isotope of hydrogen.

Hydrogen has no neutron.

It contain only one proton and one electron.

But the deuterium contain one neutron and tritium contain two neurons,

these are the isotopes of hydrogen.

Explanation

ND23-4-2023

Explanation

Nuclear energy is a form of energy released from the nucleus, the core of atoms, made up of protons and neutrons.

This source of energy can be produced in two ways:

fission – when nuclei of atoms split into several parts – or fusion – when nuclei fuse together.