For an observer who stays in one spot when the source of a sound is moving,

the sound wave's:

O

A. frequency changes.

O

B. amplitude decreases.

O

C. speed increases.

O

D. amplitude increases.

Why is permeable soil best for plants that need a lot of drainage?

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

Once similarity and one difference between a mixture of elements and a mixture of compounds