B positive patients can receive blood from B positive, B negative, O positive and O negative donors.
Answer:
It only records trends in population at fixed locations in the ecosystem.
Explanation:
The point count method is a method used to monitor the populaton of birds in certain places that consists on having someone fixed at one spot and record all the birds that he can spot by sight and by ear, so if he sees or hears a certain bird he records it, to have a close idea of the species of birds that there are in a certain location, the problem would be that it only records trends at fixes locations in the ecosystem.
Answer:
B
Explanation:
blood only absorbs end products of digested food .
The wings' because the butterfly can blend with it's surroundings with it's wings.
<span>Specific gravity is the mass or density of a substance expressed as a ratio of the same volume of that substance in a standard reference substance. For solids, the reference substance is usually water. For example, if solid substance Z has a specific density of 1.5, that means that solid substance Z weighs 1.5 times as much as the standard substance (water).</span>
