Rafael models a longitudinal wave using a coiled-spring toy. If he wants to model a longitudinal wave that carries more energy, how should he move the end of the spring?
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O side to side, using larger motions
O side to side, using smaller motions
O forward and back along the spring, using larger motions
O forward and back along the spring, using smaller motions

O forward and back along the spring, using larger motions

Explanation:

Longitudinal wave that carries more  energy, he move the end of the spring by pushing the spring forward and backward directions using larger motion that creates two regions in the spring, the crowded area known as compression and more distance between parts of the spring known as rarefaction. If  there is more compression in the spring so there is a lot energy present in the spring. So it is only possible when using larger motions in the spring.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

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!