Which of the following cellular materials is solely composed of dna and proteins? golgi complex mitochondria ribosomes chromosomes

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell

People in developed countries tend to have a larger ecological footprint then people in developing countries