Explanation

Animals are classified into two main groups:

1. Invertebrates (animals without a backbone). Examples: insects, spiders, squids, octopuses, starfish, corals, worm
2. Vertebrates (animals with a backbone. Examples: fish, amphibians, reptiles, birds, mammals (including humans)

Explanation

Uranus is four times the size of the Earth.

Uranus appears greenish in color because of the large amount of methane gas present in its atmosphere.

****

Explanation

Chlorophyll is a compound that is called a Chelate. 

Photosynthesis depends on the presence of chlorophyll for the absorption of light.

There are about five closely related chlorophylls:

1. chlorophyll a
2. chlorophyll b
3. chlorophyll c
4. chlorophyll d
5. chlorophyll e
6. chlorophyll f

Explanation

• Luminous objects are those that emit light of their own.
• Such as the sun, stars, light/electric bulbs, glowsticks, torch, lamps, candle, fire flies, lantern fish and neon tube.
• They produce their own light through various processes like incandescence, fluorescence, or bioluminescence.

Explanation

Number of moons in the planets

Saturn: 83

Jupiter: 92

Uranus: 27

Neptune: 14

Mars: 2

Earth: 1

Venus: 0

Mercury: 0

Explanation

Penguins are the birds which do not fly but swim to go from one place to another.

Penguins have flippers which help them swim underwater

Penguin means پنکھ دار بحری پرندہ

Explanation

Number of moons in the planets

Saturn: 83

Jupiter: 92

Uranus: 27

Neptune: 14

Mars: 2

Earth: 1

Venus: 0

Mercury: 0

Explanation

Uranus is an extremely cold planet and it's called Ice Giant.

It's identical to the planet Neptune.

It has 27 moons.

It's largest moon; Titania.

Additional information 

The coldest planet in the solar system is Uranus.

Its average temperature is -224°C (-371°F).

While Neptune is also extremely cold, with an average temperature of -214°C (-353°F),

Explanation

In a solid state, particles cannot move from their position.

They can only vibrate at their mean position.

 The particles in solids vibrate about fixed positions; even at very low temperatures.

***

ND18-1-2023

Explanation

In liquids, particles are quite close together and move with random motion throughout the container.

Particles move rapidly in all directions but collide with each other more frequently than gases due to shorter distances between particles.

With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion.

ND2-03-2023