Answer:Answer:
For 1: The correct answer is Model 1, 2, and 4.
For 2: The correct answer is Option 1.
Explanation:
For 1:
An element has 3 subatomic particles: electrons (E), neutrons (N) and protons (P).
Atomic number is defined as the number of protons or number of electrons.
Atoms having same number of protons are same. From the given models, Model 1, 2 and 4 have 2 protons with different neutrons. Hence, these models belong to same element.
For 2:
A compound is defined as a substance in which two or more types of elements combine in a fixed ratio. For Example: is a compound made out of atoms of carbon and oxygen.
Hence, the correct answer is Option 2.
Archae can live in extreme settings, like super cold or super hot places
Archae have no peptidoglycan in cell walls, while Eubacteria do
Eukarya are things like fungi, plant, animal cells
Not all Eukarya have cells walls
The correct answer would be the third option. The correct plan for the experiment would be that the type of salt and the amount of water are controls, and the amount of salt and the density are variables. Sheila wants to know the affect of varying the amount of salt to the density so it is the density and the amount of salt that is being changed while the type of salt and the water are kept constant since they are not being investigated.
