The answer is genetic variation because crossing over leads to changing the traits inherited by the daughter cells
Answer:
The correct option is : d. smooth muscles.
Explanation:
The urinary bladder is a muscular, hollow organ present in the pelvis, that is responsible for collecting and storing urine, before the removal of urine by the process of urination.
It is surrounded by a layer of smooth muscles. The smooth muscle of the urinary bladder contract and expel the urine from the body, by the process of urination.
The correct answer for the question is B. Fossil.
Fossils are remnants, traces of animals or plants, from the past ages that have been preserved. Fossils may be classified as cast and mold fossil, insect preserved in amber, petrified wood, compression fossil of a fern and pyritized ammonite.