What procedure describes the external filtration of blood to remove toxic substances when kidneys fail?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

What are the pros and cons of transect sampling?

Are gametes exactly the same? explain why or why not?