Answer:
The correct answer is option (D) there was a time in Pennsylvania history when dinosaur existed.
Explanation: A paleontologist discovers a rock slab on which the footprints of a Pennsylvania dinosaur are well preserved. This means that there was a time in Pennsylvania history when dinosaur existed in this area. Here fossil is a fragment of rock on which the footprints of dinosaur is present.
They hide in places like driftwood and vegetation
The original source of all energy in a food web is the sun. the sun provides light energy that producers use in photosynthesis. animals eat the producers and other animals eat those animals. the energy flow goes up the web, but it all originated at the sun
Blood type is not a concern when transfusing plasma from person to person because the plasma does not contain red blood cells. when things such as organs or blood are given to people (contain red blood cells), they must match the blood type of the person receiving these things so that there is a smaller chance of the person rejecting the organs, blood, etc. due to plasma not having red blood cells, we do not need to worry about the body rejecting it.
let me know if you need help with anything else
:)
