Which structure is labeled X in the diagram below?

The protein shell of a virus is labeled X.
ribosome
lipid envelope
protein tail
capsid protein

In which state was more than 100 billion tons of coal mined in 2005?

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species

Ihave a question. diplontic animals usually produce both eggs or sperm which are :