C. When you take a step, the ground pushes back on your foot with the same amount of force. If it pushed back with less, your foot would go through the floor; if it pushed back with more, it would actually push your foot off the ground. But they're in opposite directions; your foot pushes down, while the ground pushes up.
Hope this helps!
Answer:
Having an extra toe or finger is not harmful at all, it is an uncommon chance for babies to be born with an extra toe or finger but most of the time it is amputated soon after the birth. It can't cause any harm. Though some scientists believe it could be beneficial for some stuff, such as tying a shoe with only one hand. Or playing numerous games at once. Though I would go with neutral.
P.S
Have an Amazing Day!
<em><u>-Faker/Tosrel</u></em>
Things like fungus and bacteria there is no set trophic level for them and their niche is to break down dead plants and animals or even waste ( poop)