You have been assigned the job of convincing the local school board of the best means of making up snow days in your school district. Write a draft of your presentation. (IF YOU HELP I WILL GIVE YOU BRAINIEST!)
Answer:
Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells.
Answer:
Mutation, migration, genetic drift, and natural selection are all processes that can directly affect gene frequencies in a population.
Explanation:
Answer:Valves stop blood flowing backwards
Explanation: Valve are flags of tissue that control the direction of the blood in our heart.,it prevent the backwards flow of blood. valves regulate blood from flowing back into the atria.The right and left atrio-ventricular valves prevent blood from flowing backwards into atria. When the ventricle is full,the valve prevent backwards flow of blood.