four different ecosystems each have the same number of organisms overall, but they have different numbers of species which ecosystem has the greatest chance of being devastated by a disease

idk

Explanation:

im better at math

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the temperature of the gas, in k, not celsius.