What is one reason why the classification of protists and one kingdom is difficult?

What protects the lining of the stomach from acidic gastric juices?

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. now imagine that you traveled to an earth-like planet located light-years away that is known to support life. think about what you’ve learned in this unit and make an argument for what you think would be the dominant type of life form on this planet. consider whether a notochord is required for an organism to manipulate its environment and become a dominant creature.

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?