In which type of injection are medications administered directly into the bloodstream?

How does photosynthesis show the conservation of mass and energy?

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars

What is the next step in muscle contraction after the actin changes shape