what is the difference between a virus and bacteria? give 2 examples of each and how they affect us as humans

In order to clone adult animals, scientists typically begin with a(n)

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Imagine a rocket launching from earth and travelling to the moon. in which order would the rocket pass through the layers of the atmosphere? thermosphere, mesosphere, stratosphere, troposphere troposphere, mesosphere, stratosphere, troposphere thermosphere, stratosphere, mesosphere, troposphere troposphere, stratosphere, mesosphere, thermosphere