Answer:
The movement of molecules across a membrane without the input of energy is known as passive transport. When energy (ATP) is needed, the movement is known as active transport. Active transport moves molecules against their concentration gradient, from an area of low concentration to an area of high concentration.
Explanation:
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Atoms bound together and form molecules. Molecules are a little more complex than atoms. For example water is composed of two hydrogen atoms and one oxygen atom which are both gases. Properties of oxygen and hydrogen are completely different than water molecules.
B - Many Agricultural practices bear some pretty bad impacts on the environment. A, C and D are incorrect.
<span>There are 46 chromosomes in a human zygote.
</span><span>Source(s):
Google. I also know this, just to make sure you know my answer is right!
</span><em>When the gametes join they form a cell called a zygote. Human sperm and eggs contain 23 chromosomes</em><span><em>. Human zygotes contain </em></span><em>46 chromosomes</em><span><em>. The type of cell division that produces gametes with half the normal chromosome number is called meiosis.</em></span>
Answer:
Bottom line: The planets in our solar system orbit (revolve) around the sun, and the sun orbits (revolves) around the center of the Milky Way galaxy. We take about 225-250 million years to revolve once around the galaxy's center. This length of time is called a cosmic year.
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