Create an atom with mass number equal to 3 and neutral charge. Click the red button
when done.

In order to solve the question, one must understand that:

Hence, in order to create a neutral atom with a mass number of 3, the proton and neutron number must add up to 3 while the proton and electron number must be equal.

More on mass number can be found here: link

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.