Abaseline for experimental investigation is provided by what?

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?

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Me with biology endocrine system crossword also image left i need with hw