<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.
The Answer is B. gametes ® zygote ® embryo ® fetus ® organism
Answer:Solar. Solar energy is derived by capturing radiant energy from sunlight and converting it into heat, electricity, or hot water. ...
Wind. Wind farms capture the energy of wind flow by using turbines and converting it into electricity. ...
Hydroelectric. ...
Geothermal. ...
Ocean. ...
Hydrogen. ...
Biomass.
Explanation:
Answer:
miosis
Explanation:
Does crossing over occur in metosis? No, because chromosomes do not pair up (synapsis), there is no chance for crossing over. Following cytokinesis what chromosomes do the daughter cells contain? Daughter cells contain the same number and kind of chromosomes that were in the original cell.
