respitory systym and circulatory system because you need your lungs to breathe and the blood and heart to pump the oxygen into the blood. :))
Answer:
Waves
Explanation:
Waves are moving bodies of water that crash against the shore and cause erosion.
Heterozygous is having 2 different alleles of a certain gene, meaning one is not dominant. Instead one is a recessive such as Aa
Answer: B
Explanation:
An endangered species is a species thats on the verge of extinction meaning it will be wiped out completley