Answer:
Variation. Organisms (within populations) exhibit individual variation in appearance and behavior. ...
Inheritance. Some traits are consistently passed on from parent to offspring. ...
High rate of population growth. ...
Differential survival and reproduction.
Explanation:
Blood vessels expand during hot weather and retract/ tighten in cold weather
Answer: d. Hormones control the size and shape of target cells.
Explanation:
A hormone is a substance that is released by some parts of the body but they are effective for causing an effect on the other parts or cells typically called as target cells or organs. These are responsible for controlling the physiological functions in the body of the organism.
The hormones does not change the shape and size of the target cells instead they cause the target cells to perform metabolic functions required for living.
Answer: A closed circulatory system and an excretory system consisting of tubular nephridia
Explanation:
A hypothesis<span> is an idea that </span>can be tested<span> by an </span>experiment<span>-These ideas are based upon a person's </span>observations and<span> previous knowledge or experience. </span>
