One is immune system.
Answer:
B.Lipid
Because With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of glycerol, a phosphate group, and two fatty acid chains. Glycerol
The layers above would be not as old and the layers below would be the older layers.
Birds have a hard time in cold weather, because their body temperatures are higher than those of humans They provide warmth and insulation against colder temperatures. Many birds grow extra feathers in the months leading up to colder weather, so that they'll stay warmer when temperatures drop.
Answer:
Virion Release
Explanation:
Mechanisms for virus release from cells include cell death (lysis), budding, and exocytosis. The cytoskeleton can bestow a barrier to release and some unenveloped viruses encode proteins that intrude the cytoskeleton to allow dispersal of newly assembled virions.
