Grade 8 · Science
Cells, genetics, body systems, and Earth science. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: DNA
DNA carries hereditary information.
Answer: a characteristic that can be inherited
Eye color is a classic example.
Answer: different versions of a gene
You inherit alleles from each parent.
Answer: a dominant allele
Dominant traits can show with one copy.
Answer: both alleles are recessive
Two lowercase letters, like aa.
Answer: allele combination
Phenotype is what you see.
Answer: 46
Gametes have 23.
Answer: two identical body cells
Meiosis makes sex cells.
Answer: earthquakes, volcanoes, and mountain building
Earth’s crust is in moving plates.
Answer: igneous, sedimentary, and metamorphic rocks
Heat, pressure, and weathering change rocks.
Answer: cooled magma or lava
Granite and basalt are igneous.
Answer: sedimentary rock
Layers can bury remains.
Answer: evaporation, condensation, and precipitation
The Sun drives evaporation.
Answer: the short-term condition of the atmosphere
Climate is the long-term pattern.
Answer: traps heat in Earth’s atmosphere
Gases like CO₂ absorb outgoing heat.
Answer: slide past each other
The San Andreas Fault is a famous example.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
