Which body system contains the organ in the diagram above?

Which body system is pictured?

Our cells all have ID cards called ___. A cellular ID not recognizedby the body will cause the immune system to react.

Animals have nervous systems that

The function of the excretory system is to control homeostasis and

The skeleton of a mammal is

One way an ectotherm can warm its body is to

In the diagram of rock layers above,

Which of the following terms explains why this separation of squirrels resulted in their inability to interbreed?

If a mutation introduces a new skin color in a lizard population, which factor might determine whether the frequency of the new allele will increase?

This animal is a platypus. After observing the body adaptations, which environment would the platypus be the most fit for?

The guppy is a species of small freshwater fish. Scientists observed that the average size of guppies in a pond decreased over a few years after a guppy predator was introduced into the pond. Which of the following best explains the change in guppy size?

The species of finches that Charles Darwin found on the Galápagos Islands displayed different structural adaptations. One of the adaptations that Darwin noted was the

Darwin called the ability of an organism to survive and reproduce in its environment

The opossum, which is native to North America, and the kangaroo, which is native to Australia, are marsupials.

The fact that both these mammals incubate their immature offspring in a pouch could allow one to infer that they--

Which graph shows disruptive selection in which one group of finches has a short, parrot-like beak and another group has a long, narrow beak?

In genetic drift, allele frequencies change because of

A scientist is studying the fossils of different species of monkeys. What information would the scientist be most likely to gain from studying these fossils?

The table below shows a comparison of some amino acids found in the protein cytochrome c. Given the information in the table, which pair of organisms are likely to be most closely related? (hint: have the most amino acids in common)

If an allele makes up one half of the frequency of a population’s allele for a given trait, its allele frequency is

The study of similar patterns of early animal development is known as

The endosymbiotic theory proposes that chloroplasts in eukaryotic cells arose from

The graph shows the highest fitness toward the center of the curve. When individuals with an average form of a trait have the highest fitness, the result is

Adult mountain lions (Puma concolor) are almost 2 meters long. They have a black spot over each eye. The common names used throughout the United States for this species are listed below.

Why is it best for scientists to use the name from the standardized taxonomic system?

While visiting a national park, a student encounters an unfamiliar organism in a damp area near a body of water. The student notes that the organism is about 10cm long, has four legs, and has a tail. The organism is black with small white spots on its smooth, moist skin. It also appears to have an internal skeletal system. To which class does the organism most likely belong?

The Linnaean taxonomic system classifies organisms into divisions called taxa. If two organisms belong to the same taxonomic group, they are related. Similarity at which of these levels indicates the closest relationship?

At what taxonomic level do the bush anole and ferret diverge?

A species has the scientific name Mustela nivalis. Which animal from the chart is it most closely related to?

A team of scientists collected a unicellular, prokaryotic organism that lived in a volcanic hot spring and had lipids in its cell membrane that were not found in any other group or organisms. The scientists most likely classified the organism into which of the following kingdoms?

The Domains Archaea and Bacteria contain the following types of living things.

In the scientific version of an organism’s name, which of the terms is capitalized?

The table shows the classifications of western gorillas and humans. Based on the table, what is the most specific level of classification in which western gorillas and humans are different?

The most inclusive taxon is the:

What is the only taxon in which members can interbreed and produce fertile offspring with each other?

What is the correct way for a biologist to name a species when communicating about their research?

The correct sequence from the most (smallest) to the least specific (largest) of the taxonomic levels is:

Which characteristic applies to all organisms in the Kingdom Protista?

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a hose cell in order to -

A photograph of a virus is shown. The projections on the surface of this virus allow the virus to-

Unlike lytic viruses, lysogenic viruses do not -