A hiker of mass 80kg walks up a mountain 700m above the sea level to spend the night at the top in the first overnight hut the second day she walks to the second overnight hut 400m above sea level the third day she returns to her starting point 200m above sea level. .What is the potential energy of the hiker at the first hut (relative to sea level)
.How much potential energy has the hiker lost in the second day?

Why does bubbling occur when vinegar mixed with baking soda

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.