a scientific model is a model used to test theories. sometimes scientist use rats as a scientific model
They both help to keep all of the gas and dust in place and not just float off. it evolved from a solar nebula. stars were created in the solar nebula and they would attract gas and dust and became bigger and bigger.
Answer:
A cell may vary the rate of an enzyme controlled reaction by making more/less or degrading more/less.
Explanation:
A cell may vary the rate of an enzyme controlled reaction by making more/less or degrading more/less. Several factors affect the rate at which enzymatic reactions proceed include post translational modifications, substrate concentration, cofactors, temperature, pH, locations. The shape and structure of the enzyme will change as the pH value of the reaction medium changes.
The communities plus abiotic and biotic surroundings is called an ecosystem
