3. A freshwater ecosystem has a sandy bottom with few rocks. Invertebrates and algae live near the bottom among the rocks. Plankton live at various depths in the water. Different species of fish feed on algae, plankton and other fish. Which of these is an abiotic factor in the ecosystem? A. temperature of the water B. the number of species of algae

C. amount of food available to the fish D. the amount of plankton

Correct

Incorrect answers and why:

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards.the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?

Alexa is preparing for a presentation by creating note cards identifying keywords that describe various features of each type of plate boundary. which words apply to all three of the convergent boundaries?