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When a dinosaur fossil is found in rock strata, it is important to establish its age to place it in the grand puzzle of reptile phylogeny.  How is this accomplished?

Microfilaments such as actin, microtubules, and the intermediate filaments for the cell supporting structure called the:

The diffusion of water across a membrane from a high concentration to a lower concentration is called:

Microscope types.  Match the following terms with characteristics associated with the terms.

Did you successfully completed Unit Four Interactive Book and Videos Activities at 100% for +20 points?

Scientists were trying to determine the cause of a mysterious epidemic affecting frogs in a rainforest. A scientist made a proposal that the deaths were caused by a chytrid fungus. This is considered a(n) _________.

Based on hierarchical levels of biological organization, which of the following represents the broadest level?

Identify the stomach regions. 1. 2. 3.

Identify the structures 1. 2. 3. 4. 5. 6. 7.

In isometric pictorial views, ____ are generally not shown unless needed for interpretation of the object.