Changing states of water requires energy, where does that energy come from?

Even though the Earth's inner core is hotter than the liquid outer core, it is still solid because

How does the presence of additional nutrients affect the process of succession?

Several lines of evidence suggest that Mars once was habitable, and the Panspermia hypothesis states that life originated on Earth when it came from Mars on a meteorite.

What is the first step in recording an impression? A. Making a cast of the impression B. Testing to see whether the tool fits into the mark C. Taking a photograph D. Taking the entire impression to the lab

A tsunami travel across the ocean at a speed of 500 km/h. If the distance between crests is 200 km, what is the frequency of the wave?

When you eat a bag of cookies, your blood sugar level increases. As blood sugar levels rise, insulin levels increase to move the sugar into the cells and lower the blood sugar level. As the blood sugar level drops, so does the level of insulin.

Mendel's law of independent assortment has its basis in which of the following events of meiosis I?

Describe a procedure humans may have used to produce broccoli, which has small flowers and thick stems?

In the United States, mothers who live in poverty generally have babies with lower birthweight than those who do not live in poverty. The mean birthweight for babies born in the U. S. to mothers living in poverty is approximately 2800 grams.

Hypothesis on whether radiation has the same impact on coastal, forest, and desert areas