the answer is the first one: by producing random changes in an organism's genetic code
Answer: the atomic number is eleven because the number of protons is equal to the number of electrons which is also equal to the atomic number.
The atomic mass is the protons+neutrons which after adding will give 23.
Explanation:
The answers are wind, water, and gravity.
Solar energy is the original source of energy in most ecosystems. There must be a continual supply, due to energy only flowing in one direction in an ecosystem. Energy that is lost to heat must be replaced by more energy.
The student may look for a plant wall, because cell walls are present only in plant cells.
