A concentration gradient is the difference between
two concentrations
Active transport allows cells to transport molecules
against a concentration gradient
Diffusion results in a net overall movement from a low
concentration to a high concentration
In diffusion particles are moving around randomly in
all directions
Osmosis requires energy from respiration to be carried
out
Partially permeable membranes allow any molecules
to pass through them
Explanation:
a) True. The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse.
b) True. Active transport requires cellular energy to achieve this.
c) False. Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration.
d) True. For diffusion to work, the particles must be able to move around.
e) True. Osmosis requires energy from respiration to be carried
out.
f) False. Partially permeable membranes allow only water but not other dissolved substances to pass through.
the fish release gas so that can go up above the water breath and then go back into the water
b. one is IBi
c. both are IBi
d. nothing, this is impossible
The right option is; D
Establishment of communities in newly formed environments, such as volcanic lava flows or sand bars, is called primary succession. Development of new communities in disturbed environments, such as a burned or clear cut forest, is called secondary succession.
Primary succession is a type of ecological succession (changes) which occurs when communities of organisms establish new habitat in areas that are not capable of sustaining life due to various events such as volcanic lava flows, sand bars, oil spills, flooding, and landslides.
Secondary succession occurs when a smaller scale disturbance such as forest fire affect a stable existing ecosystem. Such disturbances support the reappearance of life because it does not remove all organisms and nutrients from the existing ecosystem.
Answer:
D. primary succession, secondary succession
Explanation: