Q: If vertebrates have a complete digestive system and a closed circulatory system, then what do all vertebrates have? Answer choices: - sensory neurons - characteristics - a complete digestive system - Veins and arteries. - sub-units of species - wings and feathers - gills - gizzard
A: a complete digestive system

Q: If the mass of the sun causes its gravity on Earth, then what causes gravity on the Earth? Answer choices: - the Sun - friction - heat - Movement - wind - ligt - quadriceps - mines
A: the Sun

Q: If wind turbines can produce electricity, then wind turbines can produce what? Answer choices: - hydroelectricity - dangerous - electricity - heat energy - toxic waste - sunlight - Destroy bridges - massive damage
A: electricity

Q: If transportation is used for moving things, then what does transportation do? Answer choices: - dries - adapt - improve - speed - recovers - driving - freezes - moves
A: moves