Two birds are fed different types of bird seed to determine which type causes the bird to gain more weight. Which of the following is an experimental error?
The birds are different species.
The birds are allowed to eat all be seed they wanted.
The birds are exposed to different amounts of light and heat.
D All of the above.
No controls are mentioned in the design.

Ase your answer to this question on the information below.hydrocarbons and fissionable nuclei are among the sources used for the production of energy in the united states. a chemical reaction produces much less energy than a nuclear reaction per mole of reactant.the balanced chemical equation below represents the reaction of one molecule of a hydrocarbon with two molecules of oxygen.chemical equation: ch4 + 2o2 → co2 + 2h2o + 1.48 × 10−18 jthe nuclear equation below represents one of the many possible reactions for one fissionable nucleus. in this equation, x represents a missing product.nuclear equation: write an isotopic notation for the missing product represented by x in the nuclear equation.

Can someone me with 3 and 4 plz. this is for masteries test.

Which proportionality applies to avogadro’s law?