Answer:
Your body has different kinds of cells. Though they might look different under a microscope, most cells have chemical and structural features in common. In humans there are about 200 different types of cells and within this cells there are about 20 different types of structures or organelles.
Mass transit can help reduce air pollution in urban cities because there are fewer cars on the roads, creating less pollution.
Answer:
B. Oxygen molecules recombine to allow cells to get larger
