Answer:
The earliest oxygen-producing life forms were Cyanobacteria. Besides Cyanobacteria, these tiny organisms have another name known as blue-green algae
Explanation:Some scientists think that 2.4 billion years ago is when organisms called cyanobacteria first evolved, which could perform oxygen-producing (oxygenic) photosynthesis. Other scientist think that cyanobacteria evolved long before 2.4 billion years ago but something prevented oxygen from accumulating in the air
Explanation:to control global warming we should control the green house gases which are the carbon dioxide formed by burning fossil fuels, methne formed by burning Agricultural fields, and also the nitrous oxide from nylon manufacturing.
So as a solution we should use technologies whichcan reduce smokes like by using solar and electric cars and recycling wastes instead of burning
Answer:
There's longitudinal,circular and obligue (diagonal)
Explanation:
These muscles allow the stomach to churn the food during digestion.
