Cumulative Exam — Cumulative exam Answers

When calcium levels in the blood are too low, the body releases a hormone that removes calcium from the bones. A person who suffers from a certain type of thyroid disease will often have low blood calcium and brittle bones because the body is taking the calcium from the bones. The afflicted person will typically see an endocrinologist, who studies hormones, and an orthopedist, who studies bones. What do these two doctors have in common?

Carlos is collecting data about the length of earthworms in his backyard. The shortest worm he found is 4 inches long; the longest worm is 8 inches long. If most of the worms are either short or long, which type of distribution is displayed in the population?

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?

Which factors affect natural selection?

What will happen to the frequency of the recessive allele for the HbS gene when there is an outbreak of malaria?

In the heart, one ventricle pushes blood with oxygen to the cells of the body. Where does the other ventricle push the blood without oxygen?

The coyote's diet includes a wide variety of small mammals, livestock, birds, reptiles, carrion, fruit, and vegetables. It is one of the few animals that has enlarged its range since human encroachment began. Which is the most likely reason for this?

What is an ice age?

The tundra ecosystem of Alaska is known as a “cold desert.” It receives very little precipitation, about four inches annually. However, it is rich in wetlands due to permafrost, which traps moisture close to the surface. The temperatures vary widely, also producing persistent winds. Although treeless, the Arctic tundra is an abundant ecosystem. Many organisms find their niche here including many migratory bird species and mammals such as caribou, foxes, bears, and small rodents. Which factor of the tundra ecosystem is biotic?

What most likely happened to the population of deer in 1963 and 1964?

Which describes a disruption in the water cycle that could affect photosynthesis?

The Great Pacific Garbage Patch is an area in the North Pacific Ocean that contains trash and causes harm to ocean life and those that consume that life. What lessons can be learned from this floating pile of trash?

Why do a chicken embryo and a cow embryo look very similar even though the adults do not?

What is the main component of the thin filaments in muscle fibers and is responsible for muscle contraction?

Consider the cladogram.According to the cladogram, which characteristic was used to separate bony fish from amphibians?

Arianne recently traveled abroad where she enjoyed eating food from different countries and learning about different cultures. A week after she returned home, she checked into the hospital with signs of nausea, fever, and diarrhea. What best explains what happened to Arianne?

Keisha cut her hand, which caused a lot of bleeding. Which mechanism did her body use to minimize the blood loss?

If a deer eats grass, what percentage of energy will the deer acquire from the grass?

A founding population of lizards arrives on an island. Which type of isolation would most likely result in this population becoming a new species?

In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils. What can be determined from this information?