Explanation:
ECOSYSTEM:
BIOTIC AND ABIOTIC FACTORS
An ecosystem includes all living things (Biotic factors) and their non-living environments (Abiotic factors), in a given area, interacting with each other.
Write any three biotic and three abiotic factors in the given picture.
Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
Explanation:
Answer:
False
Explanation:
I think. I'm so sorry if I'm wrong! I hope this helped.