Why are tissue samples from healthy and cancer cells taken from the same patient?

The energy needs of a human population are not affected by

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

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt