A. Unlike all other elements, hydrogen and helium are gases
<h3>What is special about hydrogen and helium?</h3>
Hydrogen and helium are the lightest elements in the periodic table having mass number 1 and 2 respectively. They both exist in the form of gases at room temperature. Both Hydrogen and helium are the two most common elements in the universe. Hydrogen make up about 75% of all matter present in the universe. Hydrogen belongs to the metal group but it is not metal but a gas.
So we can conclude that option A is the right answer for the given question.
Learn more about helium here: brainly.com/question/26226232
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Answer: It should be the letter C
Explanation:
Answer:
where is the model.........................
Answer:
C. the interaction of the moon, the Sun, and Earth
Explanation:
-The moon's gravitational pull on the Earth and the Earth's rotational force are the two main factors that cause high and low tides.
The motor neurons is the answer but I'm not sure
