Answer:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.
Explanation:
A "mutagen" is any physical or chemical agent that interacts with DNA to cause a mutation.
Answer;
G1-phase
The first checkpoint in the cell cycle where a cell will be caused to exit the cycle it this point is not passed is the G1-phase.
Explanation;
The interphase of the cell cycle contains three phases, G1 , S and G2 phases. It begins with G1 phase (G stands for gap). During this phase, the cell makes a variety of proteins that are needed for DNA replication. When the cell passes the G1 checkpoint it enters the S phase of the cell cycle, during which DNA is replicated, after the replication, the cell leaves S phase and enters G2, where the cell prepares for mitosis or meiosis.
Answer:
In order for a cell to divide, it must first make a copy of its own DNA, which is the genetic code it needs to function properly. It is very important that your DNA is replicated accurately, with new cells receiving an exact copy of your genetic sequence.
Explanation:
