Answer:
Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane. Gas exchange in gills and lungs operates by this process. Carbon dioxide is produced by all cells as a result of cellular metabolic processes.
Explanation:
To gather data or information or to observe. HOPE THIS HELPS!! IF SOO LET ME KNOOW
A line segment is a line that has two points on both ends. A point is just as it says, a point that shows a coordinate within a geometric figure. A ray on the other hand is a line with one point on one end and an arrow on the other. A vertical line with an arrow at each end then is a line. The arrow shows that the line extends further.
The answer is C.