Answer: Option D
Explanation:
The blood from the mother carrying oxygen, and essential nutrients is carried to the fetus.There is no different system available in the developing fetus which aids in its growth and development.
The region representing A provides oxygen and nutrients to the fetus and removes carbon dioxide from fetus.
This can be defined as an intersection between the fetus and mother so that there can be exchange of materials.
The brain i think that is correct
Scientists currently monitor underground movements, such as earthquakes and nuclear tests, using seismometers – instruments that measure the motion of those events at the Earth's surface.
Answer: Antigens
Explanation: The ABO system of blood grouping is based on the basis of the type of antigens that are present in the red blood cells. Erythrocytes is another name for the red blood cells. Antigens are molecules that are capable of eliciting immune response. There are two types of antigens: antigen A and B. Blood type A has only antigen A, blood type B has only antigen B, blood type AB has both antigen A and B while blood type O has no antigen (neither A nor B antigen).
Similarly, Rh trait is determined by the presence or absence of rhesus antigen in the erythrocytes. Rhesus antigen is an antigen first discovered in rhesus monkey. Rh+ indicates the presence of rhesus antigen in the red blood cells while Rh- indicates the absence of rhesus antigen in the red blood cells.
