If sand is formed by weathering, then what does weathering do? Answer choices: - protect them - form sand - form plants - It expands - form snow - form fossils - Metling snow - watershred
form sand

If mammal hearts have two more sections than fish hearts, then how many sections does a fish heart have? Answer choices: - ovum - fat - four - p53 - two - cut - bone - stem
two

If nerves can sense pressure, then what can sense pressure? Answer choices: - thermometers - pressure cookers - sharks - fur seals - nerves - animals - humans - skin cells
nerves