State structural modification of the kidney of desert animals like kangaroo and rat ​

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

Achange in which factor will affect the rate of reaction only when gases are involved? temperature pressure surface area concentration

What happens to the amount of waste in the pond as the ecosystem ages?