Muscle cells can stretch and contract. This is their specific cellular function. What type of molecule in muscle cells allow them to carry out this function? 1) sugars
2) RNA
3) fats
4) proteins

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home. what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

What will happen if deforestation continue to destroy the green plant on the planet

How can an organ, such as the lungs, work for multiple body systems?