Matter and energy both can neither be created or destroyed True or false
Please explain thank you!

True

The law of conservation of energy, also known as the first law of thermodynamics, states that the energy of a closed system must remain constant—it can neither increase nor decrease without interference from outside.

Explanation:

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.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: