Which of the following groups makes up a system? a. cell membrane, nucleus, cytoplasm
b. stomach, eyes, ears
c. heart, blood vessels, capillaries
d. food molecules, mouth, stomach

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Tides that occur during the new and full moons

What type of plant is good for a bioassay and where can i buy it? i only have a month.