Agroup of scientists are studying the internal parts of a cell. which microscope is most appropriate for these scientists to use?

electron microscope

Explanation:

took the test

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies