The virus envelope is derived from the host cell membrane. Therefore, the envelope is made of molecules arranged in a . These molecules have a head group and two tails. Because the cell membrane is , the membrane is able to form around the budding virus particles.

The virus envelope derived from the host cell membrane.  Therefore, the envelope is made of phospholipid molecules arranged in a bilayer.  These molecules have a hydrophilic/phosphate head group and two hydrophobic/fatty acid tails.  Because the cell membrane is fluid, the membrane is able to form around the budding virus particles.

Explanation:

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%