Bactrian camels, dromedaries, llamas, and alpacas are all members of the same taxonomic family, Camelidae. Members of this family all have two toes, no hooves, true canine teeth, and a split upper lip. The family Camilidea originated in North America. The physical features of animals in this family and the family's geographical origin provide evidence that all these animals -

In 2010, scientist excavated a skull fossil that provides evidence of a newly discovered species of big cats. Base on the evidence, scientists hypothesize that big cats branched off from smaller wild cats about 6 million years ago. Which of these resources did the scientists most likely rely on to form their hypothesis?

An analysis of DNA and RNA sequences can be used to classify organismms. A dendrogram, such as the one shown above, is based on molecular data. It can be used to represent evolutionary relationships within a group of organisms that are hypothesized to have descended from a common ancestor. Which statement is best supported by the information in this dendrogram?

The limbs of several organisms are shown in the illustrations above. Scientists sometimes compare limbs of these organisms to look for evidence of common ancestry. These limbs provide evidence of common ancestry because they -

The quiver tree grows in desert areas in southern Africa. In recent decades average temperatures have been rising in southern Africa. Scientists predict that this warming trend will continue. Quiver trees in the hottest parts of their range near the equator are dying, but quiver trees at high elevations or in parts of the range that are farther from the equator are growing and reproducing. Which of these best explains what is happening to the quiver tree population in southern Africa?

Which condition is essential for natural selection to result in a new species?

A prey population consists of individuals with a variety of running speeds. The adaptation that allows some of these animals to run fast would be an example of natural selection if it helps them-

Nudibranchs are marine gastropods that lack shells. Many of these gastropods retain the foul-tasting poisons of their prey and secrete them when threatened. The bright coloration of the nudibrachs warns predators to avoid them. Based on the information, how has adaptation allowed marine gastropods to be successful without a shell?

A harmless scarlet king snake and a venomous coral snake have similar band patterns, as shown above. For the scarlet king snake, the adaptation of having a banding pattern like the eastern coral snake's is known as mimicry. The outcome of this adaptation in the scarlet king snake is to -

Common baboons live on the savanna in breeding groups called troops. While females tend to stay with the troop, younger or less dominant males may leave to join a neighboring troop. Which of these is a likely outcome of movement by young males?

Some organisms have genes that improve their ability to survive and reproduce. If the genes also help their offspring survive and reproduce, then which of the following will most likely increase?

Organisms are classified today using the Linnaean system, and the table shows the taxonomic classification of two marine organisms living along the Pacific Coast. Taxonomic classification is important to marine biologists because it provides a way to -

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

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

The classification of four trees are shown in the table. Which two trees are the most closely related?

Five general characteristics of organisms in kingdoms Plantae or Fungi are listed in the box. Which table correctly lists the characteristics of the organisms in the two kingdoms?

Using a light microscope, a student identified the following characteristics of four organisms found in a sample of pond water. Based on the observations of the student, which organisms most likely belong to the taxonomic group of bacteria?

Arthopods are joint-legged animals. Spiders, crabs, pill bugs, centipedes, and millipedes are example of the many types of arthropods. Which of these arthropods are most closely related?

Simple leaves have a single leaf on petiole, or stem, while compound leaves have more than one leaflet on a petiole. The unknown leaf can be identified using the dichotomous key. Which tree does the unknown leaf come from?