Why do plant cells have chloroplasts and cell walls?
the answer of this question is The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress. and
this answer is for the cell wall
The 1. is the gene, 2. - dna and the last one is the rna :)
Answer:
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. ... When the rocks break, the earthquake occurs.
Explanation: