Which is produced when an egg and a spem unite during a plant s life cycle? spore
meiosis
zygote
gametophyte

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Are the earth's ocean floor and continents the same age geologically? why or why not?

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins