The double-walled membranous sac enclosing the heart is the

Random genetic changes to a species can result in no observable changes in the species. However, if the specific genetic change becomes great enough, a species can produce a new genetic branch. This event is called:

If a cell contains a set of duplicated chromosomes, does it contain any more genetic information than the cell before the chromosomes were duplicated?

What is the difference between a spore and a zygote?

Define universe.!

All multicellular organisms are called

Which moon phases are direct opposites of each other in both appearance and position?

During Mendel's first set of experiments, he allowed true-breeding tall plants to cross with true-breeding short plants. What happened when he allowed the F, offspring from this first set of experiments to self-pollinate?

What process produced the sperm in the male flies and egg in the female flies

Explain why we would expect to find glucose in the urine of a diabetic person

What affect does extreme temperature and extreme pH have on enzyme activity?