Define a taxon. Give some examples of taxa at different hierarchical levels​

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

How can you tell the difference between rough er from smooth er?

Which of these parts of the membrane large moecules pass through it ?