3. we have about in our body. 4. most of them are cobtrolled with of muscles.
5. help hold bones together.
6. help anchor muscles to the bones.
7. without bones become soft enough to .
8.your bones and muscles are .
9.sharks don't have any , they are all cartilage.
10.where do you have cartilage in your body?

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?