<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.
Hie there!
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➡️Stay home for at least 24 hours after your fever is gone.✔️
➡️Wash your hands thoroughly and frequently. ✔️
➡️Use soap and water, or if they're unavailable, use an alcohol-based hand sanitizer.✔️
If an A (Adenine) were swapped for a T (Thymine) it will lead to A TRANSVERSION TYPE OF POINT MUTATION.
Replacement of an A with a T is a transversion type of point mutation because in transversion the purine is replaced with a pyrimidine. Since in this case only one nucleotide is replaced, it is a point mutation.
False
Plants, animals, and fungi all have pro cells
Answer:
Explanation:
El sistema inmune es una red compleja de células y proteínas que defiende al cuerpo contra las infecciones. El sistema inmune mantiene un registro de todos los gérmenes (microbios) que ha derrotado para poder reconocer y destruir el microbio rápidamente si ingresa nuevamente al cuerpo.
