At Different Stages in Development a Frog May Have Gills

question 21

True/False

At different stages in development a frog may have gills or lungs.Gills and lungs both exchange gases with the atmosphere and are homologous structures.

---

Definitions:

Shortages

A situation in which the demand for a product or service exceeds its supply in a market.

Demand

The desire and ability of consumers to purchase goods and services at given prices.

Quantity Demanded

The total amount of a good or service that consumers are willing and able to purchase at a given price within a specific time period.

Demand Curve

A graphical representation showing the relationship between the price of a good or service and the quantity demanded at various prices.