Melanie and Brody want to find out whether wooden bats or metal bats allow baseballs to
travel farther.
Melanie asks five different people to hit
ten balls with each type of bat and she
measures the distance each ball travels.
Brody researches the physical properties
of the pine wood and the aluminum metal
and then estimates the possible distance
a ball could travel with a given force.

Which student conducted an experiment
and which student conducted an
investigation? Explain your answer.

Experiment = Melanie. Investigation = Brody

Explanation:

Melanie conducted an experiment because she performed an actual test.

Brody's thing was an investigation because he did research.

Almost everyone who has ever used an aluminum bat "knows" that they perform better than wood bats. It is pretty much an accepted fact that balls come off metal bats faster than they do for wood bats.

Explanation:

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!