Scientists found a fossilized imprint of a prehistoric organism that had characteristics of a fish, but the bone structure of its fins resembles
the forelimbs of some modern land animals. This is an example of a(n)
transitional fossil
trace fossil
original material fossil
None of the above

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.