What is the relationship between tissues and organs?
A: Organs are made from different types of tissues.

Generally, the deeper rock layers of Earth are older than shallower rock layers. How can the collision of two tectonic plates change the order of the rock layers?
A: The rock layers are compressed forming faults and folds.

Which organ is most responsible for oxygen entering the blood stream?
A: lungs

What event happens in a daily cycle?
A:
high and low tides