I am doing a test to see if there is a connection between how long you run and how fast your heart beats. I will be performing an experiment where a person will run for a 1 minute and I will check their heartbeat. Then they
will run for 2 minutes and I will check their heart rate. I will do this up to 6 minutes and see if there is a
connection. Before they begin I check their resting heart rate.

what are the choices?

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

protocol for imps extraction focusing on membrane protein extraction, solubilisation, and purification.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface