The answer is : randomization was not used in sample selection. The major difference between experimental and quasi-experimental designs is lack of randomization in sampling selection.
Answer:
Henry observed <u>ecological diversity</u>.
Explanation:
Ecological diversity can be described as the variations which are present among different ecosystems and how these variations impact the life on Earth. The differences present in the aquatic and terrestrial ecosystems are defined by the ecological diversity.
As Henry is observing the differences in the aquatic life as well as the terrestrial life, hence he is studying ecological diversity.
Ecological diversity is a type of biodiversity i.e diversity of all the living components of ecosystems.
it is the force with which a body is attracted toward Earth or another celestial body. This means that when you are in space, away from Earth, objects do not weight anything since they do not feel gravitational attraction to the Earth. Objects can have a large mass, but weigh nothing.
