Answer:
The age of fossils are in millions.
Explanation:
These fossils were present on the earth millions of years ago due to different and unique structure of the fossil. The fossil is present in the bottom of the middle layer indicates that the more age of fossil i.e. millions of years according to the law of superposition. This law states that in an undisturbed layers of rocks, the top layer is the younger layer than middle and bottom layers which is older than the top layer, so we can say that fossils from deeper layers are older than fossils from the top layers of rocks.
It would be Li and F because Li has 3 electrons which means it has an unstable outer shell as it would have 1 electron in the outer shell, however, F has 9 electrons and it needs 1 more electron in its outer shell in order to become stable so it will be shared with Li
Answer:
Is the explanation of life in Earth.
Explanation:
At the begging in the era called Archean, 3500 millions of years ago, the first life forms or Earth started to appear, in seas, where there were nutrients, water, heat from sun, etc. Later on 2500 millions of years ago, the first stromatolites appeared, they were so important because were the first group of cyanobacteria together, they can start to produce a little bit more oxygen in water seas. In the precambrian era (600 millions of years ago), the bacteria evolve into a complex living things like worms, jellyfish, etc. to the cambrian period, they evolve in the first vertebrate animals. by the ordovician period (489 millions of years) the first plants started to appear in Earth, turning the atmosphere greener because of the photosynthesis that they made. and at that time also, the ocean seas started to separate the continents ( the supercontinent called Rhodinia). Later in Devonian period ( 418 millions ago) the first reptiles started to appear on earth, with this step the first animals appear to conquer the Earth. By evolution, these animals turned into different living things like birds and dinosaurs. It was until the Jurassic period (200 million of years) where the pangea split in different continents and it was the gold era of dinosaurs. Later until the Quaternary period (1.8 millions of years) humans we started to appear.
Answer:
B: They have half the normal amount of genes
Explanation: