A researcher asks whether musical ability is mostly inherited or shaped by lessons and practice. Which core developmental issue is being studied?

A psychologist asks whether language develops gradually or through distinct milestones like babbling, first words, and two-word speech. Which core issue is this?

A study asks whether highly impulsive preschoolers usually become highly impulsive adults. Which core developmental issue does this question address?

A researcher compares identical twins raised apart to estimate genetic and environmental effects on personality. Which core issue is central?

A team tests 10-, 30-, and 60-year-olds one time to compare reaction speed. Which design is this, and what is a major weakness?

Researchers follow the same 200 children from age 5 to age 18, testing memory each year. Which design is this, and what weakness fits it?

A psychologist measures social media habits in current 13-, 17-, and 21-year-olds during one semester. Which design and weakness match?

A study begins with newborns in 2026 and retests the same children at ages 2, 4, and 6. Which design and common weakness are shown?

To estimate aging effects on memory, a lab compares today's 40-, 60-, and 80-year-olds in a single week. What design is used, and what confound is likely?

A language study retests the same children every six months from age 1 to age 5. Which design is this, and what extra weakness can repeated testing create?

A pregnancy is 10 days after conception, and the developing cell cluster is moving toward implantation. Which prenatal stage is this?

At week 6 of pregnancy, the heart, brain, and limb buds are forming rapidly. Which prenatal stage is being described?

At week 14, organs are present and the body is growing and becoming more functional. Which prenatal stage is this?

Which order correctly describes prenatal development from earliest to latest?

A pregnancy is in the third month, after the embryonic period has ended. What term names the developing organism?

A newborn has a small head, a smooth groove between the nose and upper lip, a thin upper lip, and later learning difficulties. Which teratogen-related condition fits these signs?

A harmful chemical causes the most damage when exposure occurs while the heart and limbs are forming. What principle of teratogens does this show?

Two pregnancies involve the same teratogen, but the higher exposure is linked with more severe harm. What teratogen principle is illustrated?

A fetus is harmed when nicotine crosses from a pregnant person's bloodstream through the placenta. What is nicotine in this situation?

A newborn's cheek is stroked, and the baby turns toward the touch with an open mouth. Which reflex is this?

A newborn hears a sudden loud noise, throws both arms outward, then pulls them back in. Which reflex is shown?

When a finger presses a newborn's palm, the baby's fingers curl tightly around it. Which reflex is this?

A doctor strokes the sole of a newborn's foot, and the toes fan upward and outward. Which reflex is being tested?

What do infant vision studies generally find about newborns' visual preferences?

What does research on infant motor development generally show?