Tiffany was investigating how fast it took Hayden to react to different sounds. Independent variable: Different sounds.
Dependent variable: How. fast Hayden reacted.

Identify at least 2 variables that Tiffany should keep constant in this experiment?

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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in addition to spreading humanist ideas, erasmus has contributed to criticism of corruption in the church.

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.