The correct answer here is "cell membrane". Generally it makes sure that nothing enters or leaves the cell, except by its highly guarded "gates", such as ion channels, that let some particles through - but they're very picky about whom to let in!
Explanation:
Solids:
Particles stay close together with a pattern
Particles do not flow freely
Definite shape and definite volume
Liquids:
Particles are closer together (compared to gas) with somewhat of a pattern
Particles flow freely
Somewhat strong attractive forces that hold an indefinite shape
Gas:
Particles spread out without a pattern
Particles flow everywhere (they are like kids on a sugar rush)
Weak attractive forces that hold no shape or volume
Indefinite shape and indefinite volume
Not entirely sure what compressibility is so i skipped that one for all of them
You subtract the number of protons and the mass to get the number of neutrons.
Answer:
Plants
Explanation:
Plants can make their own food through a process called photosynthesis.
Answer:
Elbow
Explanation:
Muscle works in pairs and groups e.g biceps flexes the elbow and triceps extend it and it is called antagonistic muscle action.
The working muscle is called the primer mover or agonist. The relaxing muscle by another muscle is called synergists.
When muscles cause a limb to move through the joint range of motion,it could be synergists or antagonists.
I hope this will help you
