Blank #1 is myosin
Blank #2 is actin filaments
Carbohydrates, they break down easily
Answer:
glucose
Explanation:
The digestive system breaks food down into nutrients such as glucose. Now the circulatory system enters the picture. It transports glucose and other nutrients from the digestive system to the cells. The circulatory system also transports oxygen from the lungs to the cells.
Natural selection is what makes evolution occur, it is one major cause of evolution. Certain species survive and die due to natural selection. The strongest and most evolved will survive vs the weak and not evolved species. Species have to adapt to their environment and natural selection is constantly causing species to keep evolving over time.