There are three types of teeth found in primary teeth in child .1)incisor ,2)canine and 3) molar.

Our first set of teeth start to grow when we are just 6 months old and are called primary teeth. These are the teeth that fall out as we grow. This first set contains 20 primary teeth. By the time you turn 13 years old all of your primary teeth will have fallen out, primary teeth are replaced by a second set of teeth called permanent teeth. Human adults have 32 permanent teeth, which is twelve more teeth than the first set of primary teeth.

You can't grow crops on mount Everest cause crops likes the balance and proper weather to survive whereas everest has no proper weather.

Given

u=90km/h = 90× (5÷18 )=25 m/s

v=0 

t=10sec

A/F

a=(v-u)÷t

a= (0-25)÷10

a=-25÷10

a= -2.5 m/s^2 (-ve value beacuse body is retarded)

The green plants can prepare their own food. The excess amount of food is stored in the seed to nourish the little young plant. The unique way by which green plants make their own food is called photosynthesis (Photo = light, synthesis = to make).

The process of transformation from an immature form to an adult form in two or more distinct stages.
Two insects that undergo the process of metamorphosis are:

1. LADYBUGS (COCCINELLIDAE) 
2. MAYFLY (EPHEMEROPTERA)

Asexual reproduction includes fission, budding, fragmentation, and parthenogenesis, while sexual reproduction is achieved through the combination of reproductive cells from two individuals.

Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parents". The cloning of an organism is a form of asexual reproduction. By asexual reproduction, an organism creates a genetically similar or identical copy of itself.

Porcupines, porcupine fish and starfish have spines on the surface of their body. The spines can injure enemies that go near or attack these animals.
a) Porcupines raise their long, stiff spines as a warning when their enemies go near them.
b) A porcupine fish can inflate its body by drinking a lot of water.This raises the sharp spines on the fish’s body. The spines help to keep the fish’s enemies away.

Some animals have body shapes or colours that match their surroundings. This makes it easier for these animals to hide from their enemies.
a) Leaf insects have green body parts that look like leaves.
b) Sticks insects have along, thin body that look like a stick or twig.Their body colour is also similar to the colour of twigs.
c) Zebras have black and white stripes on their bodies. This makes it more difficult for their enemies to spot them from a distance.

Centipedes, cobras, wasps and scorpions ca defend themselves from their enemies by using their poison.
a) Centipedes and cobras can bite their enemies to weaken or kill them.
b) Wasps and scorpions can sting their enemies to weaken or kill them.

Animals are grouped according to which type of food they eat :

• Herbivores :They depend for their nourishment on plant parts or products. eg: cow ,goat, etc.
• Carnivorous :They consume other animals for their survival. eg: lion,tiger,etc.
• Omnivorous :They consume both plant and animals. They can live on both diets.eg :humans,etc.
• Scavengers:They consume the dead and decaying matter and are often called the cleaning agents of natural environment. eg: vulture, hyena 

There are different types of animals around us. The large number of animals in the world can be broadly classified into two groups on the presence and absence of the backbone.

1. Vertebrates (Animals with backbone) Some animals have backbone called vertebral column and a hard skeleton of a number of bones. Fish, frog, bird, lizard, snake, tiger, rabbit, whale, man, etc. The backbone is a part of the skeleton.
2. Invertebrates (Animal without backbone) Some animals have no backbones. They have soft bodies because there is bony skeleton inside. Snail, an earthworm, a bee or a mosquito, etc. are invertebrates.

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An animal that feeds on carrion, dead plant material, or refuse.

Examples of scavenger animals include: Vulture, Carrion beetle, Blowflies.

Most animals have some form of adaptation to make them more successful and increase their chances for survival. One such adaptation is camouflage. Many animals have evolved to exhibit some form of camouflage, which is an adaptation that allows animals to blend in with certain aspects of their environment. Camouflage increases an organism's chance of survival by hiding it from predators.

The disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings.

Properties	Aestivation	Hibernation
Pattern	Summer sleep	Winter sleep
Duration	Shorter	Longer
Resting place	Moist, shady or cool	Warm
Species	Cold blooded amphibians	Cold blooded as well as warm-blooded reptiles and amphibians
Example	Snails, frogs, lizards, earthworms, crocodiles, etc.	Insects, mouse, birds, bats, mammals, etc

An aerial root may be defined as a root which, for part of the day at least, is exposed to the air. The mangrove mud is rather anaerobic (oxygen poor) and unstable and different plants have root adaptations to cope with these conditions.

Plants make food in their leaves. The leaves contain a pigment called chlorophyll, which colors the leaves green. Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis.

Recycling raw materials from end-of-life electronics is the most effective solution to the growing e-waste problem. Most electronic devices contain a variety of materials, including metals that can be recovered for future uses. By dismantling and providing reuse possibilities, intact natural resources are conserved and air and water pollution caused by hazardous disposal is avoided. Additionally, recycling reduces the amount of greenhouse gas emissions caused by the manufacturing of new products. Another benefit of recycling e-waste is that many of the materials can be recycled and re-used again. Materials that can be recycled include "ferrous (iron-based) and non-ferrous metals, glass, and various types of plastic." “Non-ferrous metals, mainly aluminum and copper can all be re-smelted and re-manufactured. Ferrous metals such as steel and iron can be also be re-used." Due to the recent surge in popularity in 3D printing, certain 3D printers have been designed (FDM variety) to produce waste that can be easily recycled which decreases the amount of harmful pollutants in the atmosphere.[80] The excess plastic from these printers that comes out as a byproduct can also be reused to create new 3D printed creations.[

Chlorophyll is a green coloured pigment found in the green leaves or green parts of the plant which traps solar energy and helps in the process of photosynthesis.