How is curdling of milk a natural change?Please answer ASAP...

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

Why do we perceive objects as retaining their brightness under different lighting levels?

What is the ecological role of food chains and food webs