Well, there are four main blood types with two variations of each (so 8 in all):
A+
A-
B+
B-
AB+
AB-
O+
O-
Now, A blood has the presence of the A antigen in it, and so it can't mix with B blood (most of the time).
B blood has the B antigen.
AB has BOTH antigens in it
O has no antigen whatsoever.
So if AB has both antigens, wouldn't it be able to receive antigens from A and/or antigens from B? And same with O, which has no antigens, which has no effect on whatever type of blood it's introduced in (which is why O is considered "the universal donor").
Now, the difference between + & - is simple, and has almost no impact on a person. If a person has +, they have Rh in their blood (it's another type of antigen), and if a person has -, the Rh factor isn't there. So if a person has positive, they have Rh, so more Rh blood can be added to it, and so can blood without the presence of Rh.
Hope this helps!
The problem being talked about in the article is the issue of <u>sea turtle bycatch</u> which happens when nets are used to fish.
The solution proposed by the article is that of Turtle Excluder Devices (TED) which allow for sea turtles to escape through flap-like openings and metal bars.
<h3>What does the article talk about?</h3>
The article talks about how the issue of sea turtle bycatch is affecting sea turtle conservation efforts because sea turtles get caught in nets that were laid for shrimp and other fish.
The solution being proferred is a TED which when added to a net, provides a flap-like opening such as metal bars that allow for sea turtles to escape the net.
Find out more on sea turtle conservation at brainly.com/question/26576608.
No blacks are 100% human.. people are black because of the pigments in your skin. That is why we have light skins and dark skins not because light skins are more human than dark skins.
D and C
Mitochondria is in the animal cells so is ER