Protections the ozone layer
Maintaining animal and human food chain
Preserving potable water and making efficient use of non renewable resources
Answer:
KEY CONCEPT The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood. The lungs contain the bronchi, bronchioles, and alveoli
Answer:
In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".
Answer:
Please see below
Explanation:
Shikonin is a natural drug used in the wise traditional Chinese medicine to treat inflammatory diseases. Its use as an anti-cancer drug has been recently discovered. It affects the concentration of calcium ions and ROS (Reactive Oxygen Species) which induces a loss of function in the cancerous cell mitochondria. This deprives the cancer cell of the needed energy to function.
A. carbon dioxide levels above normal