The last one
some cells are living and some cells are not
i think
Answer:
An acid increases the hydrogen ion concentration in a solution, while a base decreases the hydrogen ion concentration. pH is used to measure the concentration of H+ ions ([H+]) and therefore, whether a substance is acidic or basic (alkaline).
Explanation:
Please make mine the brainliest
Answer: 
Explanation: Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.
Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight and turn it into chemical energy in the form of glucose which is used a s a source of energy by many organisms.
The balanced chemical equation for photosynthesis is written as :

Answer:
<u>Competition</u> describes an interaction in which two organisms that interact must use the same limited resources because they are competing for them.
Explanation: