Answer: observation
Explanation: scientific method is the process which scientists use to provide an accurate and reliable explanation to a phenomenon.
It usually involves the observation and description of a occurrence,the formulation of hypothesis to explain the occurrence and then experiments to test the accuracy of the hypothesis.the experiments may prove the hypothesis right or prove it wrong,in which case the hypothesis may be modified or discarded.
In this case the farmer has noticed the yields in his crops and he might bring an explanation(hypothesis) that seems reasonable to him and will have to test the hypothesis to verify it.
Marine fish gills have cells that have the ability to can remove salt by pumping it into the salt water.
This is active transport in real life.
Hope this helps!
Answer: Hope this helps you!
We still don't know how much the universe extends/how big it is.
Even after many world changing discoveries about the universe, it is still unclear if the universe extends forever or not. There is no proof whether the universe ever ends, or if it is infinite. Ever since the time of the ancient Greeks, and even in the current days it is still unknown. Aristotle, a Greek astronomer developed the basic principles of the universe, and he was pretty much almost right. Even though he did this, it was only 384-322 BC, and back then along with developing the basic idea of the universe, he also inferred that the universe was infinite. Moving on to other astronomers like Aristarchus, Giovanni Cassini, Jean Richer, Heinrich Wilhelm Olbers, they all discovered something new in the field of astronomy, however, none of them, even if they inferred if space was infinite or not, nobody ever found out whether the universe had an end. Nobody was ever able to solidly support their claims whether the universe was never ending or not.
The root tips are the most suitable area to complete this project.
Plants and other multicellular organisms through the process of photosynthesis