Why do bats cahnge their body temp at night

Scientists often perform repeated investigations. What is the main reason for this.

What two particles make up the nucleus of an atom?

How do humans effect the ecosystem

Epithelial tissues always exhibit polarity; that is, they have a free surface and a basal surface. Epithelial tissues always exhibit polarity; that is, they have a free surface and a basal surface. True False

Which statements are true regarding the cosmological principle? The universe looks the same from all directions, but can change and evolve over time. The universe looks the same from all directions, and hasn't and won't change or evolve over time.

Approximately how many years does it take Pluto to revolve around the sun

Which substance must be present for cellular respiration to take place?

What process describes the transfer of heat through matter by molecular activity? conduction convection radiation evaporation

true or false / body systems constantly monitor internal and external conditions in the body, and respond to return the internal conditions to equilibrium

While some aspects are based on body composition is largely a result of?