What is the role of producers in an ecosystem? Choose the two correct answers. A.
They produce their own food.

B.
They consume what is produced by other organisms.

C.
They are consumed as food by other organisms.

D.
They consume other organisms to survive.

E.
They break down organisms that have died.

Which of the following units is not an official si unit? mole liter kilogram ampere

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false