How do scientist develop scientific explanations about subjects that are impossible to study through controlled experiments?

The cell theory is based on three major premises: Cells are the basic units of life. Each cell must come from a preexisting cell. All living things are made up of cells. Which of the following discoveries was the last to be made?

What is a seven letter word that fits the following description? The outer, supportive coating of a plant cell is ... ?

A 2 month old is brought into the ER following 24hrs of vomiting and diarrhea. What is the concern in a small child? Explain. What kind of symptoms would you expect to see? What might the lab results show? How can it be corrected?

What does short sighted mean

Which type of alternative energy can produce ethanol? A. hydropower energy B. solar energy C. biomass energy D. wind energy

During the transmission of signals across a neuromuscular junction, which of the following happens last?

A client who uses portable home oxygen states, "i still like to smoke cigarettes every now and then." what is the appropriate nursing response?

One drawback of dams is that they can flood land upstream from the dam and reduce water flow downstream from the dam. A. true B. False

What specific classification do humans have a tigers

In a population of birds some individuals are born with thicker, stronger beaks than others. This is a trait that is inherited. The thick beak birds are able to eat an indigenous nut that has a thick shell.