Thrips are insects that feed on the pollen and flowers of certain plants. The size of a thrip population depends on the number of flowers available. Which graph best represents changes in a population of thrips if winter was longer than usual and the summer was too cool and dry for many flowers to bloom?

The percent of DNA that species A has in common with species B, C, D, and E are shown in the graph below. Which statement is a valid conclusion that can be drawn from this graph?

Base your answer on the passage below and your knowledge of biology.

Corals come in about 1,500 known species - from soft swaying fans to stony varieties with hard skeletons that form reef bases. They are made up of polyps, tiny animals that live in colonies and feed at night on microscopic plants and creatures. The coral's surface is the living part, with color infused by single-celled algae called zooxanthellae that live in polyp tissue. The algae act like solar panels, passing energy to the coral as they photosynthesize while feeding on the coral's waste.

Extremely sensitive, corals survive in a narrow range of temperature, sunlight and salinity. An uncommonly severe El Nino in 1998 raised ocean temperatures and changed currents, causing bleaching that devastated reefs worldwide. Scientists say parts of the Indian Ocean lost up to 90 percent of corals. The bleaching struck reefs around the Persian Gulf, East Africa, Southeast Asia and the Caribbean. Some recovered. Many died

The relationship between the polyps and the zooxanthellae can best be described as

How do processes 1 and 2 affect the amount of genetic information provided by a parent to its offspring?

How does process 3 affect the amount of genetic information an offspring receives?

Which diagram indicates the areas where each of these substances would be located after 20 minutes?

Which phrase could be used to describe this technique?

The ability to grow in size is a characteristic of living organisms. Although an icicle may grow in size over time, it is considered nonliving because there is

Which cell structure is correctly paired with its primary function?

The cytoplasm in a cell carries out a function similar to a function of which human system?

Which statement best describes a human chromosome?

Four different segments of a DNA molecule are represented. There is an error in the DNA molecule in

Some human structures and their functions are listed below. In a single-celled organism such as an ameba, all these functions can be performed by the

The diagram can be used to illustrate cellular changes. Which row of terms in the chart below best completes the diagram?

A scientist wants to change the DNA of a sexually reproducing organism and have the new DNA present in every cell of the organism. In order to do this after fertilization, she would change the DNA in the

Which group would most likely have the greatest survival success during a long period of environmental changes?

Asexual reproduction produces offspring that each contain

The diagram below represents part of a human reproductive system. One of the functions of this part of the system is to

The drinking of alcoholic beverages by a pregnant woman is harmful to the development of her fetus. This is most damaging early in a pregnancy because during this time

Which substance is an inorganic molecule?

The enzyme amylase will affect the breakdown of carbohydrates, but it will not affect the breakdown of proteins. The ability of an enzyme molecule to interact with specific molecules is most directly determined by the

The disease known as malaria may result in a fever, a decrease in red blood cells, and an enlarged liver and spleen. These symptoms are evidence of

Sweating is a process that helps cool the body during strenuous exercise. This is an example of