I am thinking the rock that forms from lava that cools quickly is D) Obsidian.
Answer:
The cell membrane is selectively permeable and able to regulate what enters and exits the cell, thus facilitating the transport of materials needed for survival. ...
Explanation:
Because the membrane acts as a barrier for certain molecules and ions, they can occur in different concentrations on the two sides of the membrane.
Answer:
above fossils and fossil fuels is 6
above the sheep is 4
above the tree on the right is 1
above the tree on the left is 3
above the city is 5
Explanation:
brainliestttt
Functions of cell surface Receptors .
most ligands responsible for cell-cell signaling ( including neurotransmitters, peptide, hormones, and growth factors) bind to receptors on the surface of their target cells.