The second stage of the life cycle of a frog is _________

All animals need food, air and _______ to survive.

What part of a plant keeps it from breaking or falling?

Animals without backbones are called _________.

________ is formed when a light source is blocked.

________ is a method of seed dispersal.

________ is method of purifying water.

Who invented light bulb?

An _________ environment is one that does not meet the plant's or animal's needs.

_________ means turning into something new.

A _________ shows the direction from which the wind is blowing.

All are types of rock except _________.

Which of these is a manufactured material?

_________ means pushing a material together or squeezing it.

Which of these is not a component of a circuit?

__________ is a type of clock that uses shadow to show what time of the day it is.