Question: how long would it be if you threaded all your veins together into just one big string

how do you know your hungry

why do we need food to live

how did humman get toes

How hard can a football be kicked

If my hand got chopped off, but my veins were still connected, could I wiggle my fingers?

Does being in space effect the lifespan of a human compared to a person who has not been in space ?

Will there be any different effects for children, babies and animals when they go to space, as adults and a very few

How would you react if there was no more oxygen in the world?

hi, can you explain to me how an arteriole can reduce blood flow into capillaries?

Would you say that animals bodies act the same as the human body?