The unit of length most suitable for measuring the thickness of a cell phone is a . the unit of length most suitable for measuring the height of a backyard tree is a .

Millimeter and meter

Explanation:

Cellphones are only a few millimeters in thickness.

It is easier to say 5 millimeter than 0.0005 meter.

The unit we use must help others easily visualize and understand the size of the object.

a 5 millimeter is easy to visualize than a 0.0005 meter or a 5,000,000 nano meter

In the same way, a tree in our backyard usually grow as tall as a few meters. ( remember trees in amazon forest might grow as tall as a few kilometers). so in the case of trees in our home the right unit to measure them is meters.

The correct answer is a) A satellite is warmed by sunlight.

Explanation:

Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of the Earth by the Sun. A less obvious example is thermal radiation from the human body.