Dr. Estes and his group hypothesized (made a claim) that the cause of the sea otter decline was due to increased predation by killer whales. This was an unusual idea, since killer whales and sea otters had been observed
together in Alaska for decades with no obvious interactions occurring between them. The first time a killer whale
was observed attacking a sea otter was in 1991. Nine more attacks were observed in the next seven years and it
was these attacks that finally led Dr. Estes and his colleagues to propose their hypothesis. To test this hypothesis,
the scientists needed to have information about the killer whale.
1. Make a list of at least three types of information (evidence) about killer whales you believe the scientists
might need in order to test their hypothesis that increased predation by the whales was the cause of the sea
otter decline

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.

1. watermelon, papaya, oranges, bananas, and lemons are included in this food group. vitamin c 2. you need 6 or more servings of this food group each day vitamins d and a 3. found in fruit and keeps blood vessels healthy calcium 4. vitamins found in milk bread and grain 5. a mineral that strengthens bones fruit

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."