If a substance can move across a membrane than it is said to be

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources

What is the function of the nucleus in the euglena cells you observed?

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind f fossils