Answer:
Precambrian: 4055 million years; 88% Paleozoic: 300 million years; 7% Mesozoic: 179 million years; 4% Cenozoic: 66 million years; 1%Explanation:
the following is formed when a group of tissues works together to perform a common function is called an Organ.
<h3>What is the definition of organs?</h3>
The word organ derives from the Latin term organum (instrument, tool). These structures are objects of physiology, the area of biology that studies how organisms, systems, organs, cells and molecules perform chemical and physical functions in the body.
In this case, is correct to say that an organ is formed when a group of tissues works together to perform a common function.
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Answer:
The correct answer is - checkpoints.
Explanation:
In the cell cycles, there are different stages, and before every stage are monitored by the internal controls known as checkpoints. These checkpoints monitored the errors. Checkpoints are present in 1st the end of G1, a 2nd at the G2/M transition, and the 3rd during the metaphase of the cell cycle.
The most important checkpoint is at the end of G1 which decides that cell will go in the division or not.
<span>carbon has four valence electrons in its outermost shell .. which makes it able to form four bonds to complete its valence shell ..
it forms large number of chains with its own self which makes it useful .. also it forms bonds with oxygen and hydrogen forming large organic compounds of great importance. </span>
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Answer:
phytoplankton and bacteria
Explanation:
