Answer:
Yes, it is proportional.
Proportions Explained:
Draw 2 triangles, triangle ABC and triangle DEF. Label any 2 sides of triangle ABC as measuring 18" and 4". Label the 2 corresponding sides of triangle DEF as measuring 72" and 16".
When you see if 18/72 and 4/16 are proportional, you are seeing if triangle ABC and triangle DEF are similar. One way to do it is with proportions, which is the way we are doing it. When making proportions, you want to put corresponding sides into the same fraction. For example, let's say you labeled side AB as 18" and side BC as 4". In triangle DEF, let's say you labeled side DE as 72" and side EF as 16". When making proportions, you want to put the corresponding side lengths (AB and DE) into the same fraction. Second fraction, same way. Just remember that the second fraction has to correspond with the first fraction. If you put the side length of triangle ABC on top and the side length of triangle DEF on bottom, you need to do the same for the second fraction.
But, they did the previous steps and want you to do the rest:
Now you have two fractions: AB/DE and BC/EF, or 18/72 and 4/16. Fully reduce each fraction, and if they come out to the same fully reduced fraction, they are proportional and the two triangles are similar. 18/72 reduces to 1/4 and 4/16 reduced to 1/4. 1/4=1/4, so the final answer is yes.
Definitely the letter B
<span>She couldn't believe it; she'd forgotten the cake</span>
Answer: anything u want
Explanation: an interest, favorite show, character, etc;
Answer:
Viruses are prone to clumping together. Many times extensive sequence changes may not make a difference in antibody recognition. While sometimes small changes in HA are sufficient for a large antigenic distance. That is, with few mutations, some Hemagglutinins may be much less recognized by the antibodies.
Explanation:
As the virus replicates in the body of infected people, the immune system captures several pieces of viral protein, the antigenic antibodies, and produces antibodies against them. There are other types of immune responses, too, but they do not cause long-term immunity, so that is beside the point. The two main viral targets of the antibodies are Hemagglutinin and Neuraminidase, since they are the most exposed proteins of the virus. When antibodies associate with them, in addition to signaling macrophages and other types of defense cells that that foreign body (the virus) has to be attacked, they can still prevent the virus from working. An antibody that attacks the Hemagglutinin receptor recognition region prevents it from associating with cells. They are the so-called neutralizing antibodies.
