Answer:How long each heart beat are apart
Explanation:
the vein isnt conected to ur heart :P
Answer:
This is most likely not the answer you're looking for, but I believe the main function of any organism's reproductive system is to reproduce.
Explanation:
A. <span>Exposure to an antigen
Exposure to viruses and antigens led to the foundation of modern vaccination. Vaccination introduces an antigenic material that helps the ability of the immune system to adapt a specific pathogen, therefore leading to a long-term immunity.</span>
Answer:
#19 = The cell is an animal cell because it's missing the organelles required in plant cells(chloroplast, vacuoles, and the cell wall)
#20 = The mitochondria would be most likely to be affected because it's the powerhouse of the cell, provides energy, and imports proteins. I hope this helps.
Explanation:
I think is D,,,,,,,,,,,,,,,,,
