PLEASE HELP

Calcium hydroxide is .

an acid
a base
a neutral

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?