Which statement describes a situation that would reduce the stability of a forest ecosystem?*

Although the digestive system is primarily responsible for the breakdown of food, this process can be disrupted if the circulatory system malfunctions. The best explanation for this disruption is that*

When an organism reproduces asexually, it usually has*

The diagram below represents a food pyramid in an ecosystem.

The best explanation for the decrease in the amount of energy transferred to each succeeding level is that much of the energy is*

The corn we eat today is larger and has more kernels than the corn people first grew thousands of years ago. Which process is most likely responsible for the changes that have occurred?*

Which statement is correct concerning hereditary information?*

Which process is most closely associated with the regulation of water loss from the leaves of trees?*

A mutation occurring in a human can be passed from parent to offspring when it occurs in a*

If the concentration of sodium is greater outside a cell than inside the cell, which process could move sodium out of the cell?*

The basic building blocks of a protein are*

Over time, data that support the successful evolution of a species would include observations that describe*

Caffeine is a compound found in the seeds of many different plants, such as coffee beans, cola nuts, and cacao beans (the source of chocolate). The presence of this chemical in all three types of plants suggests that these plants*

Male turkeys are birds that naturally strut and display their large tail feathers, which attracts female turkeys. This display is an example of*

A scientist at a large natural history museum has a collection of fossils that were found throughout the world. Only a few of the fossils represent species that are still alive on Earth today. One reason for this is that*

Which statement concerning sexual reproduc- tion is correct?*