Answer:
Scientists believe that the different types we know emerged as early humans adapted to infectious diseases.
Explanation:
Different human blood types probably emerged to ward off infectious diseases. The incompatibility of some blood types, however, is only an "accident" of evolution. But this is a relatively recent problem, since blood transfusion has been around for only a few hundred years.
There are four main blood types. The oldest is B, which must have originated about 3.5 million years ago - it existed even before the human species evolved from its hominid ancestors, from a genetic mutation that modified one of the sugars in the surface of red blood cells.
Approximately 2.5 million years ago, mutations inactivated sugar, resulting in type O blood, which has neither type A nor B. sugar. AB blood, as it is easy to suppose, is covered by both sugar A and sugar by B.
Answer: No light = emanate unescapable death if that is your question
Explanation: If starvation doesn't kill you some other person trying to survive will now if you will excuse me I am going to go tell someone else the harsh reality we all live in
Answer:
When monarchs eat the milkweeds,they become toxic to other animals because the milkweeds carry toxins in them that only they can eat. Also some milkweeds can help cure their disease and parasites to make them uninfected.
Explanation:
Well, According to
<span>
BBC - GCSE Bitesize: Blood,
</span> White blood cells can engulf bacteria and other pathogens by phagocytosis. They can change shape easily and produce enzymes that digest the pathogens. Other types of white blood cell secrete antibodies that help destroy pathogens.
There are very interesting facts, and stories to that site, Plus, I am not Copying and pasting, If I ever do, I tell you the site to where it Found your answer too. :)
