If deep valleys are formed by flowing rivers through erosion over long periods of time, then what are formed by flowing rivers through erosion over long periods of time? Answer choices: - deserts - a hydraulic system - deep valleys - pyramids - Calcium carbonate - patch reefs - buildings - Sediment
deep valleys

If starfish have a unique water vascular system with tube feet, then what kind of animals has a water vascular system with tubed feet? Answer choices: - animals - starfish - reeds - insects - warm-blooded - sponges - sea coral - four limbs
starfish

Q: If roundworms reproduce by combining an egg and sperm to form larvae, then roundworms reproduce by combining an egg and sperm to form what? Answer choices: - larvae - plants - offspring - Flowers - seeds - infants - kittens - puppies
A: larvae

Question: If insects can change population size through movement, then what can change population size through movement? Answer choices: - cows - ducks - goats - animals - relocation - mammals - fur seals - insects
Answer: insects

*Question*
If moose begin behavior intended to attract a mate in autumn, then when do moose begin behavior intended to attract a mate? Answer choices: - Winter - howling - The past - sweating - Summer - autumn - ligt - movement
**Answer**
autumn

Q: If adecay curve is used to determine the age of fossils, then what is used to determine the age of fossils? Answer choices: - Calcium carbonate - dinosaurs - a barometer - electron microscope - a thermometer - a decay curve - chemical equations - Physical weathering
A: a decay curve