Answer:
The options:
What would be the next step in this experiment?
A. construct a hypothesis and record data
B. make observations and draw a conclusion
C. ask questions and construct a hypothesis
D. analyze the results and make a conclusion
The ANSWER should be D
D. analyze the results and make a conclusion
Explanation:
It should be D, the hypothesis has been proposed by her and she's left with conclusion on the experiment. From the type of exleriment, she has little observations to make since there's is a remote conclusion in a set time period.
Answer:
Rocks.
Explanation:
Scientists study rocks from the Precambrian period because isn't really a significant fossil record from the Precambrian.
Answer:
The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot.
The correct answer is - 4. a flash flood.
Most of the people in the world live on the coasts or very close to the coasts in the places with very low elevation. If the circumstances are right and something manages to trigger a sudden rise in the sea level, like an asteroid/meteorite impact on the poles, than it can very easily have a devastating effect on the humans.
If an asteroid/meteorite hits one of the poles, than in only few hours the sea level will rise significantly, and that will cause a flash flood, where there will be not enough time for the people to evacuate themselves, and most of the population will be directly influenced by it, thus causing hundreds of millions, if not over a billion deaths.
