Were there animals or creatures on Earth?

The order of appearance of living things on the earth is from low to high, from simple to complex, from imperfect to perfect.

Bacteria are the lowest, followed by plants, and animals are the highest, and these three categories of organisms also follow this law.

Among plants, fruits belong to the phylum Angiosperms.

Already a higher form of the plant. Before angiosperms, there were gymnosperms, ferns, and even early cyanobacteria.

Wait. Due to the lack of direct evidence such as fossils, it is now generally believed that angiosperms were in the Late Jurassic period of the Mesozoic Era.

It appeared in the Cretaceous period, and in the Cambrian period of the Paleozoic era.

The "biological explosion" began, and by the Carboniferous period of the Paleozoic Era, amphibians began to evolve into reptiles.

In terms of time, angiosperms appeared about 100 million years ago, while reptiles appeared in ancient times.

billions of years.

So, the conclusion is: although plants appeared earlier than animals, the ancestors of the fruit plants that you are talking about belonging to the phylum Angiosperms, appeared later than land animals. In other words, angiosperm plants evolved gradually through natural selection after the emergence of animals

Anaerobic organisms appeared first, and then there were organisms that could obtain energy from light, that is, they could photosynthesize, and some animals appeared after oxygen slowly became available on the earth.

1. One of the earliest organisms in the world was cyanobacteria.

2. Cyanobacteria appeared on the earth about 3.533 billion years ago, and they are the earliest photosynthetic oxygen-emitting organisms, which have played a huge role in changing the earth's surface from an oxygen-free atmospheric environment to an aerobic environment. There are many cyanobacteria (e.g. anaanaea) that can directly fix nitrogen in the atmosphere (reason: it contains nitrogenase, which can directly carry out biological nitrogen fixation) to improve soil fertility and increase crop yields.

3. Cyanobacteria are a class of large single-celled prokaryotes with a long evolutionary history, negative Gram staining, flagella, chlorophyll a, but no chloroplasts (algae different from eukaryotes), and can carry out oxygen-producing photosynthesis. The difference with photosynthetic bacteria is that photosynthetic bacteria (Rhodospira) carry out relatively primitive photosynthetic phosphorylation, and do not release oxygen during the reaction process, and are anaerobic organisms, while cyanobacteria can carry out photosynthesis and release oxygen.

o( o Hello, the formation of the earth was as early as 4.6 billion years ago, when there was a huge celestial body in the universe**, ** after the formation of a huge nebula, and then the nebula slowly condensed to form the solar system.

In the solar system, due to the collision of rocks, some are smashed into pieces, some are cemented into larger stones, and there is a much larger rock floating in the solar system than the surrounding (this is our earth today), the larger the volume of the rock, the greater the gravitational force, which attracts more rocks, through continuous impact and bonding.

The temperature of the earth's surface is extremely high, and the magma shoots out in all directions, forming a fireball, and the rocks contain a variety of elements, some of which contain a large amount of water, and due to the high temperature, they are vaporized into space at the moment of impact. Coincidentally, at this time, the demonstration of hitting the earth suddenly decreased, and the rising gas was pulled back by the gravitational pull of the earth and floated in mid-air, the rocks hitting the earth decreased, and the temperature on the ground began to drop, and when it fell to 300 degrees, the fate of the earth changed! The clouds have also come down, and it's the first time it has rained on Earth!

The rain fell to the ground and was evaporated, and more rain was produced, and the ocean was formed, and the formation of the ocean was a split second compared to the formation of the ocean when the earth was hit by rocks

In the first place, there were no animals on Earth, only microorganisms, and there was DNA, in the depths of the oceans. Because there was no oxygen on the earth at that time, most of the gas released by the burning of rocks was carbon dioxide in the air. There are many genes in the sea, some form fish, some form seaweed plants, seaweed plants contain chlorophyll, and from time to time oxygen bubbles will rise in the sea to rise to the earth's surface, and oxygen will slowly form here, and carbon dioxide will become a large amount of limestone in the ocean.

With oxygen on land, many plants have developed on land. There is more and more oxygen! Later, animals slowly developed to live on land.

That's how we humans slowly evolved! Thank you (o).