In the process of photosynthesis glucose is produced from carbon dioxide and water <span />
For the first question, I would say a line graph. And the one about the human heart, I need some more information.
The time period being referred to is the sensitive period. This time period is also referred to as the critical period. The importance of a critical period is such that it must involve certain stimuli from which an organisms learns and acquires traits. If some of these stimuli are not present in the critical period, the organism has difficulty acquiring the trait or skill, and may even find it to be impossible to learn the skill.
You can prove they're related by their DNA