write your answer to these questions in complete sentences on a sheet of paper.

draw a first- class lever. show the fulcrum, effort force, and resistance.

draw a second-class lever . show the fulcrum, effort force, and resistance.

draw a three-class lever. show the fulcrum, effort force, and resistance.

what is work input? what is work output?

what does efficiency tell you about a machine?

it works really well

Explanation:

because it says efficiency

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

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