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They are called producers because they're able to produce their own food by the process of photosyntessis.
cholesterol in the cell membrane is to maintain stability, anchor other molecules, and keep the membrane fluid in cold temperatures.
Answer:
C
Explanation:
organ systems are group of organs working together to carry out a specific function. organ systems carry out unique functions that helps the body to live and grow.
Answer:
Option D, It is highly efficient, as oxygen-rich air enters the lungs even while a bird is exhaling
Explanation:
In the respiratory system of birds, air flows only in one direction due to which a bird is capable to take in oxygen even when it is exhaling. The air sacs allow only unidirectional flow of air, which is more fresh and contains high oxygen content. Even a bird’s lung are capable to store and pump air, when they are at stationary position.
Hence, option D is correct.
Answer:
circulatory system
Explanation:
Oxygen and nutrients are taken to body parts by the Circulatory System (also named Vascular System)