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?
The overgrowth of algae poses a major problem for coral reefs. Intensive fishing is one factor that contributes to algae overgrowth because it does which of the following?
Which is NOT found within the nucleus of a cell?
A difference between prokaryotic and eukaryotic cells is the
Two substances are mixed in four beakers, and a thermometer is placed in each beaker. The thermometers are checked every minute for five minutes, and the temperature is recorded in the table above.
Which beaker shows the greatest temperature change over five minutes?
Look at the table above. Which conclusion is best supported by the data in the table?
Alex tested three brands of batteries to learn which would last the longest in a flashlight. He placed two brand "A" batteries in a flashlight, turned the flashlight on and measured the time that the light shined. He repeated the experiment with battery brands "B" and "C" using the same flashlight. He recorded the data on the bar graph above. Which of these is an accurate conclusion that Alex can make about the batteries he tested?
Jeremy conducted an experiment that compared the effects of difference sounds on the growth of bean plants. He planted bean seeds of the same type and size in three containers using the same type of soil in each container. He placed the containers in the locations shown above. Jeremy gave each plant the same amount of water at the same time each day. After two weeks, Jeremy observed that the plant in the living room was the largest and had the most leaves. Jeremy concluded that the bean plants grow the fastest when exposed to television sounds. Which is the greatest error that Jeremy made in his experimental design?
Which number will complete the chart above?
After examining the fossil record, scientists have determined that scorpions today are much smaller than their extinct ancestors. For example, Jaekelopterus rhenaniae, a giant scorpion species that lived 255 million to 460 million years ago, was 2.5 meters long. Which of the following conclusions is supported by this information?
A student is studying the ecology of a playa lake, which forms after a rainfall in a dry lake bed. The table above lists the organisms that the student observed. Which level of biological organization has the student described in the table?
The Texas blind salamander (Eurycea rathbuni) lives in the Edwards Aquifer region around San Marcos. Along with other species the salamander lives in total darkness in the underground crevices and caves of the aquifer region. The table above lists some of the organisms that live in this environment and their food sources. In an energy pyramid for these aquifer cave dwellers, which of the following would be placed at the bottom?
A harmless scarlet king snake and a venomous eastern coral snake have similar band patterns as shown in the photograph 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
The limbs of several organisms are shown in the illustrations above. Scientists sometimes compare the limbs of these organisms to look for evidence of common ancestry. These limbs provide evidence of common ancestry because they
All the biotic and abiotic factors in a small forest form a(n)
Which of the following is a biotic-biotic interaction?
The removal of which of the following would have the biggest impact on a marine ecosystem?
Small birds eat insects from the backs of rhinoceroses. The birds obtain food and the rhinoceroses eliminate biting insects from their skins. Which ecological relationship is represented by this situation?
Water changes phase over the course of the water cycle. Which process in the water cycle most directly results from condensation?
The variety of species in an ecosystem is referred to as its
An atom has no net electrical charge because
What is often called the universal solvent?
If a material's composition varies from region to region, it can be classified as
What is the density of an object that has a mass of 184 g and a volume of 50 mL?
A compound that conducts electricity when melted or dissolved in water is a(n)
Which of these is an example of a chemical change?
This type of chemical bond exists between atoms that share their electrons with each other.
Which of these is a unit of volume?
An atom or a group of atoms that carry a charge (+ or -) is called a(n)
Which of these measurements would indicate the longest distance?
At what temperature does water boil?
What are the product(s) of the following reaction: 2H2 + O2 ------> 2H2O
On the periodic table, where are the nonmetals found?
A geologist finds a rock and breaks it into two pieces to examine the crystals inside. The two pieces of the rock are then labeled Sample A and Sample B. Sample A is twice as large as Sample B. Which of the following statements is true?