Food enters the stomach during the third stage of digestion, hope this helps.
What grade are you in if you are in 5th or 6th i can help you
Answer:
A. Supine is lying on the back; prone is lying with the back facing up
Have a good day!
Heat is generated by friction is one of the ways and fuel and air if making flames
<u>Answer:</u>
Cyanobacteria start producing pure oxygen around 200 million years ago.
<u>Explanation:</u>
Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis. This was around 4.5 billion years ago: after Hadean eon.
They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.
