a - fossil fuels
step by step explanation:
fossil fuels are non-renewable and will run out
depends on 42
subjecting an experimental group of plants to an atmosphere with a higher oxygen concentration
subjecting an experimental group of plants to an atmosphere with a higher carbon dioxide concentration
subjecting an experimental group of plants to a special soil that has been enriched with a new fertilizer
subjecting an experimental group of plants to air that gaseous nitrogen has been added to
Answer:
when a concentration gradient exists and more of the substance is on the inside of the cell
Explanation:
Active transport moves substances against the concentration gradient, from an area of low concentration to an area of high concentration. It requires the use of energy, usually in the form of ATP.
Hope that helps.
Your answer is B Genes contain pices of infromation.
