How do spines help a cactus survive? A:They protect the plant from being eaten by animals.
B:They anchor the plant to the ground.
C:They hold the plant upright and help it take in sunlight.
D:They take in sunlight and carry out photosynthesis.

Reaction rate depends on how many molecules are coming into contact with each other with enough energy to react. increasing the temperature of the reactants will increase -

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

What material does not melt at any temperature