instruction:
You are given a sentence and your task is to generate another sentence that supports the given input.
question:
At present six kinds of leptons (that is, six lepton flavors) and six kinds of quarks (six quark flavors) are known.
answer:
There are six types of leptons.


question:
The significance of these changes lies in the demonstration that they were associated with the release of calcium ion, which as a 'second messenger', was proposed in turn to activate systems that direct development of the early stages of the parasite (94).
answer:
Calcium ion is an example of a second messenger.


question:
All the elemental oxygen now in the earth's atmosphere was put there by photosynthetic plants and bacteria.
answer:

On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.