Answer: 21 percent
Explanation:
According to NASA, the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent.
Answer: Bones cells secrete an extracellular matrix that when combined with minerals becomes rock hard.
Explanation:
Answer:
Seed dispersal is the movement, spread or transport of seeds away from the parent plant.Because plants cannot walk around and take their seeds to other places, they have developed other methods to disperse (move) their seeds. The most common methods are wind, water, animals, explosion and fire.
Had to look for the options and here is my answer:
Drosophila is considered as a specie of flies, often known as "fruit flies". In their development, the influence of the bicoid protein differs along the axis of the embryo because of the presence of <span>an anterior to the posterior gradient in BICOID protein concentration in the embryo. Hope this helps.</span>
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