Which value can be measured the most easily?

What do the fungus that causes athlete’s foot, the tick that spreads Lyme disease, and body lice all have in common?

A biome extends across several continents. Parts of the biome on the different continents can be best identified by the

The competitive exclusion principle states that the _______ species prevents another species from using essential resources, causing the _______ species to become locally extinct.  

The total amount of photosynthesis is referred to as

Consider the salmon example from class that followed the flow of nutrients from the marine system to the terrestrial system in the Pacific Northwest. In this example salmon feeding in marine environments redeposited nutrients into a freshwater system.  Is this example a better representation of top-down effects or bottom up effects? Explain your answer. (2pts)

During the middle of the twentieth century, the increased elk population in the Greater Yellowstone Ecosystem led to a(n) _______ in the beaver population. The primary reason was that _______.

A bird species nests in a specific kind of tree. The tree is not harmed by the bird building its nest in the tree’s branches, but the bird benefits from the shelter provided by the tree and is better able to successfully raise young. This is an example of

Which trophic level generates the most dead organic material in most ecosystems?

Predation  A.  Starfish are predators that feed on species of herbivores (barnacles, mussels, limpets, and chitons). A study was proposed to address the following question, “Do starfish control the number of species of herbivores?” Develop a hypothesis and prediction based off that question i. If (hypothesis)   ii. Then (prediction)