Answer:
B - a smooth rock, some red dirt, and an empty bird's nest
Explanation:
Aibiotic items are things that are non-living parts of the envrionment. Of the options B is the only one that fully contains non-living items.
Answer:
Science and technology have had a major impact on society, and their impact is growing. ... By making life easier, science has given man the chance to pursue societal concerns such as ethics, aesthetics, education, and justice; to create cultures; and to improve human conditions.
Explanation:
Hope this helps~ :D
The thickness up to which the velocity approaches 99% of the free stream velocity. The distance measured perpendicular to the boundary by which the free stream is displaced on account of the formation of the boundary layer.
<h3>What is displacement thickness in boundary layer theory?</h3>
The displacement thickness for the boundary layer is defined as the distance the surface would have to move in the y-direction to reduce the flow passing by a volume equivalent to the real effect of the boundary layer.
The thickness of the boundary layer represented by δ is arbitrarily defined as that distance from the boundary surface in which the velocity reaches 99% of the velocity of the mainstream.
To learn more about boundary layer theory visit the link
brainly.com/question/15268588
#SPJ4
