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.

Time ! for a smell to begin the process of registering in your brain, first you must a) inhale odor molecules into the nasal cavity b)transduce scent chemicals c)have a scent to inhale d)all answers can work

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.