What rung of the Cosmic Distance Ladder is most appropriate for the incorrect choice's above?

Parallax
Main sequence fitting
Variable stars
Type 1a supernovae
Hubble's Law

Disinfection of impression materials is usually accomplished by a. sterilization with high heat. b. spray or immersion in a chemical disinfectant. c. sterilization with steam under pressure. d. allowing the impression to sit 24 hours in water until all the organisms die.

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..