Answer:
it happens when 2 organisms jelp each other beneficial.
Explanation:
eg:algae and leguminous plants.the algae live on the roots and take in the nitrogen from the soil,which the plant cannot do and needs for growth.it takes in the nitrogen and pases it to the roots and even make the soil loose for the roots to move and they get a living space(algae on the roots).
A method of raising livestock and moving herds.
One should obtain hs calories from the food sources which are rich in vitamins and minerals, such as fruits, and vegetables. These are low in carbohydrates and fats, and does not provide unnecessary calories, and have the essential components which help in digestion and absorption of food.
The heart pumps blood through the pulmonary and systemic circuits of the circulatory system.
In humans, the blood flows from the heart in two circuits or paths. The pulmonary circuit allows blood to flow between the heart and the lungs, while the systemic circuit allows blood to flow between the heart and the rest of the body.
The right side of the heart pumps deoxygenated blood to the lungs through the pulmonary circuit to oxygenate the blood. The oxygenated blood returns to the heart and is pumped by left side of the heart through the systemic circuit to oxygenate the rest of the body. Then, blood becomes deoxygenated as is passes through the body. The deoxygenated blood from the body flows back into the heart via the systemic circuit. The deoxygenated blood onces again moves through the pumonary circuit for oxygenation and the cycle begins again.
