In the same science fair, tina asks the question "does caffeine increase the heart rate of an
earthworm? " in test 1, she measures the heart rate by looking at the earthworm under a
microscopes the earthworm has a heart rate of 50 bpm (beats per minute). in test 2, she
places a few drops of caffeine on the earthworm's skin and measures the rate again. in this test,
the heart rate is 68 bpm.
6) what is the manipulated variable in this experiment?
7) what is the responding variable in this experiment?
8) tina's experiment should have included a hypothesis. in a complete sentence, suggest a
hypothesis for tina's experiment.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

click to let others know, how is it

mark brainliest and have a great day!

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

answer: blah

explanation:

bc blah