What is the theory of spontaneous generation? Please give an example. Thanks!!!

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

Why is excretion necessary to maintain homeostasis?