¿Cuándo tú piensas en la vida con qué sustancias la relacionas?

The model illustrates a process by which a substance is taken up by a cell

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

What type of specimens where you able to see under each of the microscopes in the microscope activity