Answer:
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
Explanation:
Answer:
D. They used simple molecules from early times and put them in a simulation from that time and it made complex ones that we have now.
Color blindness I’m guessing cause I don’t see how it has anything to do with sex linked disorders
All of the noble gases which are helium neon argon krypton
