a scale-model mound made of the same materials that make the real hill
Answer:
fals I think sorry if it's wrong
Answer:
I feel it's to easily differentiate the positive from the negative...... like in gram staining of bacteria, the colour tell us which bacteria is gram positive or gram negative...... I just feel that this is science and it is advisable to know what the opposite result of an experiment should look like.
The main reason for the species extinction is for the ecological changes.
Answer:
c
Explanation:
plants create growth by converting sunlight into energy, but all organisms need cellular respiration
