Use your senses, so sound, smell( pls waft), change in color or tempurature, bubbles, or light
Answer:
You can increase the validity of an experiment by controlling more variables, improving measurement technique, increasing randomization to reduce sample bias, blinding the experiment, and adding control or placebo groups.
Answer:
Blue and Green marbles
Explanation:
We have been given that:
Number of Marbles:
Blue(Protons) = 3
Green(Neutrons) = 4
Red (Electrons) = 3
The marble that should be placed in the nucleus of a lithium atom = ?
Solution:
The nucleus of an atom is made up of protons and neutrons.
Protons are the positively charged particles in an atom.
Neutrons do not carry any charges.
So;
The marble in the nucleus are the Blue and Green marbles.
Carbon dioxide is produced by any living creature such as ourselves when or plants during the process of respiration. Carbon dioxide is also produced by humans when we burn fossil fuels, ie running our cars or burning gas, coal or oil for energy.
