What type of rock is this? (i found it outside and it just caught my eye and it feels great having it around)

What is earths lithospheric plates interact at

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

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.