The three ways mutations can occur are
Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.
The esophagus then releases the food into the stomach and a valve, or sphincter, acts as a gateway to keep the food from going back up into the esophagus. Stomach. In the stomach, our food is sterilized and further broken down.
Answer:
Carbon
Explanation:
In addition to be found in living or once living matter, all organic compounds must contain carbon.
Answer:
The amount of the lighted side of the moon you can see is the same during
a. new moon and full moon phase.
b. new moon and first quarter phase.
c. first quarter and third quarter phase.
d. full moon and third quarter phase.
Please select the best answer from the choices provided
Explanation:
c
Answer:
D. A positive charge, because of a covalent bond with oxygen
Explanation:
A water molecule contain both hydrogen and oxygen atom. Water is a polar molecule because it has positive electric charge in one of it's poles and negative charge on the other. The hydrogen is positively charged and the oxygen is negatively charged which are bonded by covalent bond. Hydrogen is positively charged because it cannot attract electrons strongly like oxygen which is positively charged. There is unequal sharing of electrons in water molecules and this is why oxygen is slightly negative and hydrogen is slightly positive.
