River was walking down the hallway when her brother, Simon, jumped out and yelled “boo!” River reacted by jumping back quickly. Which organ systems are involved in reflex actions

Species A is a predator species, and species B is a prey species. What would be the first thing to happen if all of species A were removed from the ecosystem?

Which of the following structures can be found in the plant cell but not in the animal cell?

Which of the following is a biotic resource in a region?

Which of the following is an example of an inherited trait?

. After a wildfire, many plant and insect species in the food web died out. One season later, however, several grasses grew back. What adaptation of these grasses most likely ga

Which cell structure carries out a function for a cell that is similar to the function that bark carries out for a tree?

What is the role of the mitochondrion in the cells?

Which two plant cell structures are responsible for storing energy from sunlight and later releasing it for energy?

Bass tapeworms attach to the gills and intestines of bass fish. Theses worms survive by taking nutrients from the bass. What type of relationship is this?

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