HEY GUYS ANOTHER RELABETE MEME11 ME WHEN SOMEONE KNOWS THE ANSWER TO MATH QUESWTION

For my health class we were given a bunch of pictures of pregnancy tests for extra credit we have to say if they’re negative or positive. i can’t tell if this is a shadow or if it’s a faint positive

Cardiac output is affected by heart rate exercise stroke volume all of the above

Which one of the doll choices is a bio marker of biological again that can you determine whether or not you’re doing or worse than your chronological age