Which statements describe a host organism? check all that apply.

a host shares nutrients with a parasite.
a host loses nutrients to a parasite.
a host obtains nutrients from a parasite.
a host is dead when nutrients are taken.
a host is alive when nutrients are taken.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2