Match each item to its best description A. solar nebula

B. accrrtion disk

C. Solar system

May form after a supernova

Does not spin

A central star with planets around it

Solar nebula- does not spin.

Accretion disc - may form after a supernova

Solar system - A central star with planets around it

Explanation:

Nebula is formed within the molecular cloud and dust . The cloud formed comes together under gravity and a sun like substance is formed,Nebula does not spin and the solar system is formed from it.

The solar system is made up of medium stars also know as the sun with the planets revolving around it. We have four planet that are closer to the sun which is Earth, mercury, mars, venus and four planet a bit farther Jupiter,saturn,uranus,neptune.

Accretion disc is formed from nebula, and its a spin cloud of gas. It is formed after a supernova.

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!