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What is DNA?
Deoxyribonucleic Acid DNA is a double-helix molecule that carries genetic instructions. view more
Science & Nature
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What is a light year?
The distance light travels in one year. view more
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What is the area of a circle?
Area = πr² (pi times radius squared) Example: Circle with radius 5 Area = π × 5² = 25π ≈ 78.54 square units Remember: Use radius (half of diameter), not diameter. view more
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What is mitosis?
Cell division producing two identical daughter cells. view more
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What is a covalent bond?
A bond formed when atoms share electrons. view more
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What is the greenhouse effect?
When atmospheric gases trap heat from the Sun. view more
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What is pi (π)?
π ≈ 3.14159 Pi is the ratio of a circle's circumference to its diameter. view more
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How many chromosomes do humans have?
46 chromosomes (23 pairs) Breakdown: - 22 pairs of autosomes - 1 pair of sex chromosomes (XX female, XY male) We inherit 23 from each parent. view more
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What is the most abundant element in the universe?
Hydrogen Makes up about 75% of all normal matter by mass. view more
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What is a black hole?
A region where gravity is so strong that nothing, not even light, can escape. view more
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How do you convert 0.625 to a fraction?
0.625 = 5/8 Step by step: 1. view more
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What is the square root of 144?
The square root of 144 is 12. view more
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How do you solve 2x + 5 = 13?
x = 4 Step by step: 1. view more
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What is the acceleration due to gravity on Earth?
9.8 m/s² (or 32.2 ft/s²) This means a falling object increases speed by 9.8 meters per second every second (ignoring air resistance). view more
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What is the Pythagorean theorem?
a² + b² = c² Where: - a and b are the legs (shorter sides) - c is the hypotenuse (longest side, opposite right angle) Example (3-4-5 triangle): 3² + 4² = 9 + 16 = 25 = 5² view more
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What do mitochondria do?
Produce ATP (energy) through cellular respiration. view more
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How far is the Moon from Earth?
384,400 km (238,855 miles) average Variation due to elliptical orbit: - Closest (perigee): 356,500 km - Farthest (apogee): 406,700 km Light takes ~1.3 seconds to travel from Moon to Earth. view more
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What is the cube root of 27?
The cube root of 27 is 3. view more
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What is Newton's Third Law?
For every action, there is an equal and opposite reaction. view more
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What is 25% of 200?
25% of 200 is 50. view more