Zacharias Jansen was known for being a spectacle maker and is credited with making the 1st microscope.
True or False?

True

Explanation:

Zacharias Jansen was known for being a spectacle maker and is credited with making the 1st microscope!

False

Explanation: He only discovered helium and chemical chromosomes

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