Birds have feathers and wings.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

32 degrees Fahrenheit is 0 degrees Celsius.

Today's Celsius temperature is 25 degrees.

When I looked at the thermometer, the outside temperature was minus 5 degrees.

Oocytes play an important role in the reproduction of organisms.

Kangaroos are an example of ovoviviparity.