False! I hope all is well and you end up passing, seriously good luck! (:
Answer:
When matter changes form, it's not chemical.
Explanation:
Something like melting of an ice cream. Shredding paper. Something that changes physically. Folding paper is another example.
False, it will probably last around 50 more years
Answer:
D. Viruses can avoid activating the adaptive immune system if they do not change their surface antigens once they have been recognized by T and B cells.
E. People who were affected with the smallpox virus before cowpox virus were naturally immune to the smallpox virus because the viruses shared some common antigens and the memory cells that recognized cowpox antigens responded to smallpox antigens as well.
F. Helper T cells can kill cells that are infected with viruses and Cytotoxic T cells are known to activate B cells.
The correct answer is mitochondria.
The endosymbiotic theory illustrates that how a huge host cell and engulfed bacteria could easily become reliant on each other for existence, leading to an everlasting association. Over millions of years of development, chloroplasts and mitochondria have turned more specialized and at present, they cannot thrive outside of the cell.