Sperm cells inside the pollen grain travel down the pollen tube and into the ovary which contains the ovules. Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule
Answer:
Compost
Explanation:
Compost is rich in organic nutrients
An obligatory parasite is a parasite that can not complete its life cycle without exploiting a suitable host
Answer:
aortic arches (earthworms)
Explanation:
Earthworms vessels link together