Christopher and kate noticed that after a rainstorm some of the rocks in their yard appear to shrink. they wondered how the mass of the rocks changed when dissolved in water. to determine this, kate purchased a variety of rocks from a local shop, carefully recording the types of rocks in a data chart. christopher gathered rocks from the backyard to add to the rocks kate purchased. they measured each rock's initial mass; then they inserted the rocks one by one into 100 milliliters of water and measured the mass of each rock after it had sat in the water for five minutes. both christopher and kate concluded that store-bought rocks do not dissolve in water. they also concluded that to get rocks that dissolve in water they must be gathered directly from the yard.

q: compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city,

a:

comparing this to the inside of a food building/company.

all cells are surrounded by a plasma membrane, which protects the cell from its environment, keeping toxic substances out of the cell. it regulates which molecules are allowed to enter and exit the cell.

regulates all cell activity such as cellular metabolism, and growth in addition to storing and maintaining the cell's dna for transcription and replication. determines what proteins to make.

contains the organelles; site of most cell activity

the place where ribosomes do their working activity.

builds the proteins.

prepares proteins for use or export.

responsible for breaking down and absorbing materials taken in by the cell.

maintains cell shape.

transforms one form of energy into another.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: