_______ rely on energetic biochemical substances.

• Chemo autotrophs make their own food by using biochemical substances.
• Photo autotrophs make their own food by using sunlight through photosynthesis.
• Producers make food for themselves and others animals.

• The natural selection theory was given by Charles Darwin. 

What are predators?

• Predators feed on other animals by hunting them.
• They kill them and then eat them.

Parasites include _____worms and fleas

• Tapeworms are the parasites having flat body and lives in humans intestine and cause diseases. 

_________ are organisms that are fully reliant on their hosts for existence.

• Tapeworms are one of the examples of parasites as they live in humans intestine and also feed on that.

What is a scavenger?

• Scavengers feed on dead and decaying material like rotting plants and meet etc.

Organisms that eat the flesh of other creatures are known as ________.

• Carnivores feed on flesh of other creatures.

Deer, giraffes, monkeys, and rhinoceros are examples of ______.

• All the given organisms are herbivores as they feed on plants and leaves.
• Carnivores feed on flesh of other creatures.

What are herbivores?

• All the organisms that feeds only on plants and their components are known as herbivores.

How many species have been identified till now?

• Total two million species are found on earth till now.

How many creatures are there on the Earth?

• Almost 50 millions of creatures are present on earth or we can say that the number of creatures found on earth is 50 millions.

The increase of populations in certain niches in the ecosystem is limited by _______.

• Limited resources or lack of resources leads increase in compitition between organisms of a population.
• It controls increase in population.

What will grow rapidly if there are sufficient biotic and abiotic resources and no sickness or predators?

• A population will grow rapidly if:- 
• There are sufficient resources available whether those are biotic or abiotic.
• There is no sickness.
• There is no predator.

State true or false.
The number of species that may live in an ecosystem is determined by the resources available as well as abiotic variables such as light and water availability, temperature range, and soil type.

• Every organism needs appropriate resources to live a normal life. 
• Organisms also have to compete with each other for limited resources.
• So the number of species may live in an ecosystem is determined by the resources available in the ecosystem whether those are biotic or abiotic.

Every aspect of an ecosystem, whether directly or indirectly, is reliant on the other.
Is the above statement true or false?

• It's true that each and every aspect of one ecosystem, whether directly or indirectly reliant on the other ecosystem.