I believe the answer is d
Answer: A closed circulatory system and an excretory system consisting of tubular nephridia
Explanation:
Explanation:
Cumulonimbus clouds are a type of cumulus cloud associated with thunder storms and heavy precipitation. They are also a variation of nimbus or precipitation bearing clouds. They are formed beneath 20,000 ft. and are relatively close to the ground. ... These clouds often produce lightning in their heart.
