You can just make a table in Microsoft word that has as many squares as you need.
Go to Insert - Table, and choose either 2x2 or 3x3, depending on how many you need.
Answer:
Base pairs occur when nitrogenous bases make hydrogen bonds with each other. Each base has a specific partner: guanine with cytosine, adenine with thymine (in DNA) or adenine with uracil (in RNA). The hydrogen bonds are weak, allowing DNA to 'unzip'.
The tooth surfaces that face the tongue are known as lingual surfaces.
Bone —> provides structure for the body.
Heart —> pumps blood through the body.
Stomach —> breaks down food into small particles.
Lung —> oxygenates blood.
B. some species die out when environmental changes occur
