Arwin in 1856 proved that all pigeon breeds do originate from the Rock Dove and through a process of regression you can recreate the Rock Dove, the ancestor of all pigeon breeds. Hopefully that helped
Answer:
Molecules result when atoms share electrons,
while Ionic Compounds are formed when a metal and nonmetal combine.
Explanation:
<h2>
Answer:</h2><h2>Human blood grouping is mainly based on the antigens present on their RBC (red blood cells) and in plasma into various groups but the main antigens are namely A/B and Rh antigens.</h2><h2 /><h2>Depending on A/B antigens humans are grouped (ABO Grouping) into</h2><h2 /><h2>A group: those having A named antigen on their RBC.</h2><h2 /><h2>B group: those having B Antigen on their RBC.</h2><h2 /><h2>AB group : Those having both A B antigens on their RBC.</h2><h2 /><h2>O group: those having no antigens on their RBC.</h2><h2 /><h2>Depending on the presence of Rh antigens they are grouped into Rh positive or negative group.</h2><h2 /><h2>So if the person has both A and Rh antigens then he will be A positive blood group. But having only A antigen but not Rh Antigen then he will be A negative group.</h2>
<h2>Extra Information:</h2><h2>In addiition to these there is also the HH group. The peculiarity is that they do not express the H antigen. As a result they cannot form A antigens or B antigens on their red blood cells. Thus they can donate blood to anybody with ABO grouping but can receive blood only from Bombay blood group people.</h2><h2 />
The answer is letter c. produces protein.
<span>Water, ions and molecules requires for cellular processes, can leave and
enter cells through a passive process like diffusion. Diffusion is random
movement of molecules yet has a net direction to regions of lower concentration
in order to reach a balance. Simple passive diffusion takes place when small
molecules pass through the lipid bi-layer of
a cell membrane. Depending on carrier proteins, facilitated diffusion is
imbedded to allow certain substances to pass through, which may not be able to
diffuse through cell membrane.</span>
