The respiratory system of an elephant functions in a similar way to which organelle in a single- celled organism?*

The carrying capacity of an environment may be decreased by*

The offspring of a species of bird known as the European roller possess an effective defense mechanism. When they sense a threat by predators, the young birds vomit and cover themselves with a foul-smelling liquid.

Which two systems work together to alert the young birds of danger and help produce the vomit?*

A decrease in the biodiversity of an ecosystem usually leads to*

Down syndrome occurs when an individual has an extra copy of chromosome 21. This additional genetic material alters development and results in Down syndrome. This genetic abnormality is an example of*

Most of the reactions by which energy from carbohydrates is released for use by the cell take place within the*

Which human activity best represents a method for recycling nutrients?*

Rabbit populations vary in size over time. An increase in which factor would likely prevent the rabbit population from steadily increasing?*

The diagrams below represent two reproductive processes used by different organisms.

When compared to organisms that utilize process A, organisms that utilize process B would most likely produce offspring with*

A weightlifter has spent years building his muscular strength. His newborn daughter has normal strength for a baby. Which statement best explains this situation?*

When it is disturbed, the bombardier beetle is able to produce and release a hot spray of irritating chemicals from the end of its body, as shown in the photo below. As a result, most animals that have experienced this defense avoid the beetles in the future.

The beetle’s defense mechanism has developed as a result of*

Rejection of a newly transplanted organ is caused by*

One of the largest and oldest organisms on Earth is located in Fishlake National Forest in Utah. Pando is an 80,000-year-old grove of aspen trees that covers 100 acres. Although it looks like a forest, DNA analysis of several of the “trees” has confirmed it is really just one huge organism. Therefore, the “trees” must have been reproduced*

A female giraffe has 62 chromosomes in each of her skin cells.

How many chromosomes will be in the skin cells of her offspring?*

Many female mammals, such as dogs, give birth to litters consisting of multiple offspring. All of the characteristics described below are reproductive adaptations that female dogs have for giving birth and caring for several offspring at once, except*