It is night time. Cathy walks into her house and puts the light on The bright light makes her pupils go smaller.
This happens very quickly.
The diagram shows Cathy's eyes before she puts the light on.
SVAR
The diagram shows Cathy's eyes after she puts the light on.
1
WAKUU
mahta
KRAN
(a)
Cathy's pupils getting smaller is an example of a reflex action.
Write down two things which show that this is a reflex.

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

explanation:

i believe the answer is a or 1

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