1. A researcher is investigating if the medicine “AIDSCURE” is able to reduce the immune system dysfunction and cancer symptoms affiliated with HIV+. He gives 500 people 100mg of the drug daily, and 500 people a sugar-pill placebo daily. After a 6-month trial he measures the reduction of immune system dysfunction and cancer symptoms. What is the independent and dependent variable?

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

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