Antigenic is the result of reassortment of genes responsible for the production of influenza virus spike proteins between different virus particles while in the same host, whereas antigenic is the result of point mutations in the spike proteins.

i think its the first one

2%? i tried finding the exact sorry if it's not 100% correct ; -;

the answer is c. altitude. hope this ! #brainiac

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers