This diagram shows a 40-kg object being pulled in one direction while friction acts on it in the opposite direction. Friction
20 N
Pull
140 N
40 kg
What is the net force on the object?
A 140 N
B. 20 N
C. 160 N
D. 120 N
Sign ou

b) mutualism

hope this : )

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

well in order to answer this question you have to provide more information < 3

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: