Examlex
It is difficult to estimate when cyanobacteria appeared on Earth, because_______.
Urinary System
A group of organs, including the kidneys, ureters, bladder, and urethra, responsible for filtering waste from the blood and expelling it as urine.
Cardiovascular System
The body's system comprising the heart and blood vessels, responsible for circulating blood throughout the body to supply tissues with oxygen and nutrients.
Endocrine System
The collection of glands that produce hormones to regulate processes such as growth, metabolism, and reproduction.
Pelvic Cavity
The body cavity situated within the pelvis that houses the reproductive organs, urinary bladder, and rectum.
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