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Plantae are autotrophic (meaning they can produce their own food) and are always the producers and comprise the first trophic level - whereas most other forms of life including Animalia are heterotrophic and depend on producers (Autotrophs such as plants) to metabolise and store energy from processes like photosynthesis for their own food. This means that animals couldn't live without plants to provide their food and that plants needed to be around before animals - mostly as animals need plants but not the other way around.
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∙ 12y ago
Wiki User
∙ 13y agoAnimals would not exist without plants because plants take in carbon dioxide and give out oxygen. So if plants were not there we would not get oxygen and die. Plants also give us food and if we do not have food we will not be able to survive and it will not balance our ecosystem, in order to leave we shall have this cycle so our life will be expanded.
Wiki User
∙ 15y agoMost likely to avoid predators,
and also to gain new food sources (the plants went first).
Note also; the first big step was to move from sea water to fresh water.
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∙ 14y agoIf animals were on Earth first, they won't have any oxygen, which is what all animals need.
Wiki User
∙ 14y agoin order to create an oxidized atmosphere so that complex life can live in the sea/ on land. since most complex life requires oxygen
Wiki User
∙ 11y agoSo that way the animals would have plenty of food to eat
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What two groups did scientists divide organisms into before the sixteen hundreds?
Plants and animals.
How does the sun enable life on earth?
Well although this question sounds difficult, it is acctully very simple. the Sun is something that provides plants to grow which provides food for animals, which provides Humans with food, it also gives us vitamin D. The sun is a very very large planet which in the very far futrue will eventually become closer to The Earch which will result in all the water drying up and clearing out the human race, plants, animals ect. Eventually it will End the World.
If all life on Earth were to cease the atmosphere would revert to its primitive oxygen-poor composition and become poisonous to modern plants and animals?
true
How do plants help humans and animals?
you can help plants by not plucking them,you can help plants by watering them.you can help animals by feeding them,sheltering them, if they are lost giving them to the police.etc!!!!!!!!!!!
Why are humans more like animals than plants?
We have hearts animals have hearts , have you ever felt a plants heart beat plus can plants walk
What is the first animals and plants at the start of the earth?
There were no animals or plants at the start of the earth. Cyanobacteria maybe
Which part of Earth's system is made up of plants and animals?
Biosphere= the part of the earth where plants and animals live.
In what part of the earth's atmosphere would you find plants and animals?
You would fins plants and animals in the troposphere, where we live on earth
The only planet with plants and animals?
The only planet that we know of with plants and animals is Earth.
What is a place which animals and plants live?
Earth. Animals and plants live all over the earth. You can look for larger concentrations in jungles.
What chemical substance is found in the earth but not formed by plants or animals?
Carbon is a chemical substance found in the Earth but not formed by plants or animals.
Would plants or animals have been the first forms of life on earth?
Unicellular plants and animals were first forms of life on Earth
What do you call the rich variety of animals and plants on the earth?
The rich variety of animals and plants is biodiversity.
Other than supporting plants and animals what else does water do for the earth?
Earth does a lot of the water. It supports plants, animals, humans and soil
What do plants provide all life on earth?
Plants are a source of food and energy for herbivores. Plants are producers, meaning they make their own food from solar energy. They are the base of any food chain. Many animals, such as monkeys, birds, or insects, also live on or in plants. Finally, plants provide oxygen for humans and animals to breath. Before plants and other photosynthesizing organisms, the earth had no oxygen. Plants use the carbon dioxide that animals expel in photosynthesis, and release oxygen, which is a waste product for plants but vital for animals.
How do you know about these plants and animals that appeared and disappeared before humans were on earth?
plant and animal fossilisation... so yes fossils...
Where do all animals and plants live?
on earth
