The spines of a plant are a protection against herbivores. However, giraffes have skin on the tongue and mouth so thick that they can even eat plants with well-developed spines. The relationship established between giraffes and plants is herbivory or sybiosis

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.

In a copper wire, a temperature increase is the result of which of the following

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?