Se ha demostrado científicamente que los humanos son miembros de diferentes razas con diferentes características. Explique su respuesta a la pregunta anterior.​

What is one disadvantage of desalination? a - the process kills fish. b - the process uses fuel that is expensive. c - the process makes water that is unsafe to drink. d - the process is too difficult to carry out in big cities. quick taking a !

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans