b. a backbone.
c. two germ layers.
d. bilateral symmetry.
A. The outcome variable (dependent variable) controls the test variable (independent variable).
B. The test variable (independent variable) controls the outcome variable (dependent variable).
C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other.
D. The test variables (independent variables) and outcome variables (dependent variables) are the same things.
Answer: B
Explanation:
The independent variable is the experimenter so it changes and controls the dependent variable because it is assumed that the dependent variable gets a direcr effect from the independent variable.
Consider the statement as True or False
Answer: True
Explanation:
Natural selection can be defined as the phenomenon by which the environment changes and the to fit into the environment the genetic makeup of the organism changes in order to suit into the changing environment.
The organism that is fit to suit into the changing environment is favored and the organism that does not fits into the environment dies.
So, natural selection can be said as survival of the fittest.
Answer:
Endothelium provides a slick surface lining all hollow cardiovascular organs.
Explanation:
Endothelium is a layer made of cells that lines the interior surface of the entire circulatory system from heart to the capillaries. It forms the interface between the blood in the lumen and the vessel wall.
It is a single celled thin layer of squamous cells. It is involved in fluid filtration, maintaining the the blood vessel tone, homeostasis, hormone trafficking and neutrophil recruitment. It is of mesodermal origin. It is aligned in the direction of fluid flow.
Epithelia are layers of cells that line body surfaces and organs. Different types of epithelia have specific functions and structures. Simple columnar epithelium, stratified squamous epithelium, pseudostratified columnar epithelium, and endothelium are all examples of epithelial tissues.
Epithelia are layers of cells that line body surfaces and organs.
Simple columnar epithelium is a single layer of rectangular cells, commonly found in areas of absorption and secretion.
Stratified squamous epithelium is several layers of squamous cells, providing protection against abrasion. Pseudostratified columnar epithelium appears layered but is actually a single layer of cells, often found in the respiratory system.
Endothelium is a type of epithelium that lines blood vessels, providing a smooth surface and allowing for the movement of blood cells.
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Answer: By dying in a place that was heavily preserved
Explanation: