Which value can be measured the most easily?

After an adolescent diagnosed with attention deficit/hyperactivity disorder (ADHD) begins methylphenidate (Ritalin) therapy, a nurse notes that the adolescent loses 10 pounds in a 2-month period. What is the best explanation for this weight loss?

Species Interactions (Community Ecology) C. Use Figure 3 to answer the following questions.  A group of researchers explored species diversity (e.g., richness) in salt stressed environment, with and without herbivores.  Summarize how the presence of herbivores affect species diversity under stressful (to the plant) conditions. (2pts)     

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

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

Predation  E.  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?” In the actual experiment in which the starfish were removed, the number of herbivore species decline rapidly from 15 to 8 species, while the number of herbivore species remained at 15 when starfish were present. Did the starfish feed on the dominant or subdominant species?