Answer:
The pressure differences on either side of the valve.
Explanation:
The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
Hope this helps!
have a blessed day
Answer:
The calories Anna consumed for dinner is 315 kcal (300kcal). The calories that came from proteins is 108 kcal (100kcal).
Explanation:
Macronutrients are nutrients such as protein, carbohydrates, and fat that provide the energy required for the normal functioning of the body. Usually, the energy obtained from macronutrients is expressed in calories. Each gram of protein provides 4 kilocalories while each gram of fat provides 9 kilocalories. Carbohydrates per gram also provide 4 kilocalories.
Here, Anna consumed 7 grams of fat (in salmon)
, 36 grams of carbohydrates (in sweet potatoes and asparagus) and 27 grams of protein (in salmon, sweet potatoes, and asparagus) for the dinner.
Therefore, total calories in 7 grams of fat is 
kilocalories.
Total calories in 36 grams of carbohydrates is 
kilocalories.
Total calories in 27 grams of protein is 
kilocalories.
Therefore, the total calories Anna consumed for dinner is 
kilocalories i.e., 
kcal.
The calories that came from proteins is 
calories i.e., 
kcal.
A scientific theory is an explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.
Foxes eat a variety of animals, which includes caterpillars. On the contrary, most caterpillars eat only plants. In any ecosystem, you always have a larger number of plants than the number of animals which eat plants, and you have an even smaller number of animals which eat other animals. That is related to the flow of energy in the ecosystem:
1) The sun provides solar energy and plants use part of it for photosyntesis. Later, that energy will be stored by the plant as chemical energy.
2) Herbivore animals eat some of the plants, in order to use their chemical energy. Animals can never eat all plants because that would lead to extinction. Besides, part of the chemical energy of the plants they have eaten is wasted because it converts into heat energy.
3) Carnivore animals eat herbivore animals. Same conclusion, they can never eat all herbivore animals and they cannot use all their energy. If they are ominvore, they are sort of sharing the plants with herbivores, so herbivores can eat less plants.
Malnutrition reduces the population, so less food leads to smaller population.
Answer:
;;;;;;;;KKKKKKKNKK;KNNKL;;;;;;;;;;;LLLLL
Explanation:
NLLLLLLLLLLLLLLLLLLLLLLLLL8I GFS 999I P]
