Why is carbon said to provide a “backbone” in many molecules?(1 point) Carbon atoms can form chains and branches with each other, and other atoms can attach to these.

Carbon atoms have long narrow shapes, allowing many other atoms to attach to them.

Carbon atoms have full shells of electrons, allowing electrical signals to pass through them easily.

Carbon atoms have half-full shells of electrons, allowing electrical signals to pass through them easily.

Which is not true about oxygen-17 and oxygen-18?

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

What component of earth’s atmosphere exists entirely as a result of photosynthesis?