Although most psychoactive substances interact with specific substances in the brain cells, the effects of are much more complex because several different neurotransmitter systems are affected. a. opiatesb. tranquilizersc. alcohold. marijuana

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 description provides the best objective summary of the article in the passage?

During the final stage of the cell cycle, cytokinesis allows the cell to finish dividing, creating with copies of dna. can someone fill in the blanks?