The urinary bladder stores urine. The walls of the bladder can shrink and stretch. When the bladder is full, the muscles will
contract to empty the bladder. The urine is then released into the
urethra, which is a tube that carries urine from the bladder to the
outside of the body.
Which two body systems work together to carry out the process described in the passage?
A.
immune
B.
nervous
C.
muscular
D.
excretory
EU
respiratory
F
cardiovascular

Which is the best way to define a common in environmental science a. a worthless resource b. shared resource c. a rare resource d. a typical resource

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?