*Question*
Plant reproduction often requires pollen, and ferns are vascular plants. Given these facts, what often requires pollen to reproduce among the following options: - burrs - humans - trees - RNA - hummingbirds - ferns - bees - seeds
**Answer**
ferns

*Question*
Mutation creates new genetic variation in a gene pool, and biodiversity refers to the genetic variation of all life on Earth. Given these facts, mutation creates among the following options: - colors - biodiversity - Animal survival - genetic defects - Plants growth - rapid expansion - genetic splitting - genetic similarities
**Answer**
biodiversity

*Question*
Adult echinoderms have radial symmetry, and modern echinoderms include starfish and sea urchins. Given these facts, what has radial symmetry among the following options: - sea urchins - A Greek letter - humans - Most plants - peachleaf willow - catfish - gastropod shells - ducks
**Answer**
sea urchins

*Question*
Many corals secrete an exoskeleton that builds up to become a coral reef, and australia's coral reefs, including the Great Barrier Reef, are no exception. Given these facts, what was formed by exoskeletons among the following options: - heat produced - remains of prehistoric life - layers of fat - The area was once underwater - the Great Barrier Reef - the body's largest organ - sedimentary rocks - it keeps an organism warm
**Answer**
the Great Barrier Reef