It is referred to as a selective semipermeable membrane because it only allows certain things through, due to the size and shape of whatever is trying to get through.
Answer:
pfu/ml
Explanation:
Given -
Bacteriophage dilution
ml
Volume of bacteria and plate with top agar
ml
Number of plaques
pfu
Dilution (d) 
Final concentration of phage stock is equal to

Where pfu is the count of plaques
d is the dilution and v is the volume
Substituting the given values, we get -
pfu/ml
Try a veceroy butterfly
1. It has orange red black and white camouflage for fall leaves
2. It mimicks the poisonous monarch butterfly.
<span>3.Its color warns other predators not to eat it
</span>4. It hibernates during winter
5. It behaves like a monarch to scare off predators
Sweat glands is the major function in thermoregulation.
3)The amount of air that mixes with the gas stream