Plant cells have and animals do not have cell walls <span />
Nucleus is the answer your looking for I'm positive its correct. If you have anymore questions feel free to post them.
<span>The Earth rotates once in about 24 hours with respect to the sun and once every 23 hours,
56 minutes and 4 seconds with respect to the stars. Earth's
rotation is slowing slightly with time; thus, a day was shorter in the
past.</span>
Answer:
Birds are adapted by changing their beaks.
