The exercises that involve alternately contracting and relaxing the pelvic floor muscles are known as exercises. answer

plant because they survive by water, sunlight, ex.

explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

yes, because even though a theory has a  lot of evidence to support it, it is not always true