A. Harmful algae bloom is being put in there
Explanation:
Palaeontologists study the fossil and once they found that the fossil of an organism in layer 2 and 3. The fossil present in layer 3 is very similar to the fossil present in layer 2.
From this, it could be concluded that the layer 3 possible might be evolved from the fossil present in layer 2. The fossil of layer 3 might be a close relative of the extinct fossil of layer 2 as they could have shared a common ancestor.
Many possibilities could be explained but these two are more valid.
The best answer to this would be Proterozoic (although it actually lasted a little less than half by estimates, but it's the longest period.)
It started around 2500 million years ago and lasted till 500 million years ago- 2000 million years long. The estimated age of Earth is 4500 million years old -a little over twice this period
Answer:
"Herd or "herds"
Explanation:
Animals living together in a group for generations are called "herds" or "herd"
Because these animals have been living together for generations and more to come.
Hope it helped brainiest plz
Cytoplasm holds the cell organelles together.