Answer only if you know what everything means:
I'm trying to think of Biology IA for IB.
It needs to somehow relate to cardiology or anything with heart.

It can't be expensive. Less than or equal to 50$.
Must not be using other animals or humans.

A simple lab experiment that is cheap, high level, and somehow related to the heart.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

it's c.us forest service

b is the answer and if you need further with anything message me