Characid fishes are found naturally only in South America and Africa. Fossils of these fish are not found on any other continents. What is the most likely explanation of this distribution pattern?

Spiny seeds that cling on to  animal fur or human clothing to be dispersed is an example of:

Populations of two coexisting species are both tertiary consumers in a community. What relationship may exist between these two organisms?

The first basic idea of evolutionary adaptation can be traced back to ________.

In an aquatic food chain, small fishes that eat zooplankton are ________.

Read the following scenario to answer the questions that follow.In order to test the susceptibility of bacteria (if the bacteria are susceptible to being killed) to an antibiotic, a common laboratory test called the Bauer-Kirby Disk Diffusion test is used. First, a petri dish (a shallow, circular, transparent dish with a flat lid) is partially filled with nutrient-enriched agar (a gelatinous material). The nutrients encourage growth of specific bacterial species. The agar is poured as liquid but then typically solidifies to a soft consistency. Once the agar is set, a “lawn” of bacteria is spread such that a thin layer covers the top of the agar. Antibiotics are then applied to the lawn in a small dose, often through small, saturated paper disks. The dish is typically incubated for 24-48 hours and then observed for susceptibility. If the antibiotic is effective, it will kill the bacteria and leave a clear area called the “zone of inhibition” due to inhibited bacterial growth. The area starts at the source of the antibiotic and radiates outward. Scientists measure the diameter of the zone and then compare it to an established “cutoff value” for a zone specific to antibiotic/organism combinations. A large zone of inhibition in comparison to the standard indicates susceptibility while a small or no zone indicates resistance. Consider the following image, and answer the questions that follow: What can you conclude about the susceptibility of the bacteria to the antibiotics?

Approximately what percentage of the visible light that reaches Earth’s producers is converted to chemical energy?

The image below represents__________________since_________________________.   

A nurse hopes to improve time management skills using the ABC prioritization approach. Which tasks would be prioritized as “B”? (Select all that apply.)

When assessing an ethical issue, what is the nurse’s first intervention?