Question

read the excerpt from a science report liam is drafting. he wants the last sentence to convey how the information in the rest of his report will be organized.
choose the sentence that best establishes how his report will be organized.

animals can have unique sensory adaptations that help them interpret the environment around them. most animals rely on their basic senses of sight, smell, touch, hearing, and taste to help them maneuver throughout their habitats, but some marine and land animals also use echolocation. these animals emit sounds such as high frequency clicks or squeaks that bounce off objects and reflect back to the animal. the animal intercepts the reflected sound with its ears or other organs in its head, and then it interprets the sound using complex neural pathways. this allows it to determine the size and location of various objects in its environment. echolocation, sometimes also called biosonar, can help animals navigate and avoid obstacles in dark or treacherous environments. it can also help them hunt by giving them an idea of the size, speed, and composition of the prey they seek.
the concept of echolocation is used in sonar technology. sonar uses sounds and how they reflect off objects underwater to help identify ships, map the ocean floor, determine ocean depths, and locate underwater navigation hazards. while the concept of sonar technology is impressive, the fact that some animals can accomplish the same tasks without technology is both intriguing and impressive.

two groups of animals, bats and dolphins, have been a main focus of scientific research on echolocation.
animals that use echolocation to hunt are more successful predators than those that rely on their regular senses.
homing pigeons use their own unique sensory adaptation to navigate long distances using earth’s magnetic field.
sonar is used for other helpful scientific applications, such as locating shipwrecks and guiding remote underwater vehicles.

Explanation:

The report so far discusses echolocation in animals and its use in sonar technology. To show how the report will be organized next, a sentence that introduces the main subjects of research on animal echolocation (bats and dolphins) makes sense. The first option, "Two groups of animals, bats and dolphins, have been a main focus of scientific research on echolocation," sets up the next part of the report to focus on these animals' echolocation, which is a logical organizational step. The other options either compare hunting success (not about organization), talk about homing pigeons (a different adaptation, off - topic), or expand on sonar applications (the report already introduced sonar and the focus is on animals).

Answer:

A. Two groups of animals, bats and dolphins, have been a main focus of scientific research on echolocation.