1.) What is an organism’s niche? a.) the physical environment of the organism
b.) the role that an organism plays in the environment
c.) the traits that increase an organism’s survival
d.) the competitors and predators of the organism

2.) Which describes the habitat of a frog?
a.) color for camouflage
b.) prey for snakes
c.) eats insects
d.) marshes and ponds

3.) Elephants shape their environment in many ways. They can change a forest to a grassy field or dig a hole that might become a pond. They clear large amounts of vegetation, which removes habitats for some organisms but makes the area inviting for other organisms. Which best describes possible interactions of elephants with the surrounding ecosystem?
a.) positive
b.) negative
c.) neither positive nor negative
d.) both positive and negative

What protects the lining of the stomach from acidic gastric juices?

Choose the molecule that is described by each phrase. energy used during long activities:

With the description of the different cell walls, membranes, and associated proteins set in the students' minds, you now need to introduce them to the idea that the cell wall can also act as a foundation to build things upon. bacterial appendages require a strong foundation that will offer the support needed to move and function in a dynamic world. for example, flagella are long, whiplike protein structures that are used by many gram-positive and gram-negative bacteria for locomotion. in order to function effectively, a flagellum must be firmly anchored to the cell wall. how will you be able to get across the idea that the peptidoglycan cell wall is strong enough to support such a mechanism? with a protein rod that passes through the cell wall and protein rings used to anchor it in the membranes, these basal bodies are the rudimentary biological motors that use atp power to spin the hook and the flagella attached to it. bacterial flagella have a biological motor that spins within the cell wall and is powered by atp. this allows the flagella to spin in a whiplike motion to propel the bacterium.