If you were a merchant buying blood which blood type would you pay for the most?

O negative

Cause O negative can be transferred to all the group types... It doesn't have any antigens so it's the safest blood group to transfer

answer: mannn ion even know fam

explanation: just try asking yoo teacher yo parents or just simply another sight

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.