For a particular species of dog, brown fur (B) is dominant to white fur (b). What is the genotype of a dog that is homozygous and has brown fur?

A limiting factor is anything that keeps a population's size from increasing beyond a certain point. Which of the following would be an abiotic limiting factor for fish living in a retention pond in Florida?

When an athlete goes for a long run on a hot summer day in Florida, they sweat a lot. How would the athelete's nervous system most likely respond to this?

Several residents in a small town in the northern part of a country called Finland recently became sick. All of the sick people had the same symptoms. Scientists took blood samples and looked at them using high-powered microscopes. They finally found the organism that they believed was responsible for making the people sick. They observed that this organism appeared to be living, but could only reproduce when it inserted itself into an infected person's cell.

What type of infectious agent caused the people to get sick?

The kangaroo mouse is a small rodent that lives in the desert in the Southwestern United States. Which of the following would be the most helpful adaptation for kangaroo mice?

The food web shown is for a forest ecosystem. In this ecosystem, how would the population of rabbits change if a disease caused most of the snakes to die?

Which of the following best explains the data in the table?

A botanist is a scientist who studies plants. A botanist is studying the garden pea plant (Pisum sativum). For this plant, purple flowers (P) are dominant to white flowers (p).

If the botanist crosses a heterozygous purple plant with a purbred white plant, what is the probability that the offspring will have white flowers?

The diagram shows part of the carbon cycle. What is represented by the arrow labeled as '1'?

An 8th grade science student was asked to write down three ways that cells maintain homeostasis. The student's responses were:

1. 1. Cells reproduce through the process of meiosis.

2. 2. Cells get energy from food when cellular respiration occurs in the mitochondria.

3. 3. Cells get rid of waste products when it passes out of the cell through the cell membrane.

Which of the student's responses is NOT correct?

According to the theory of natural selection, organisms that are bigger and stronger always have an advantage which helps them survive and reproduce.

Why is an organism that reproduces asexually more likely than an organism that reproduces sexually to go extinct?

Which two plants are most closely related?

A species of insect lives in the lush green canopy of the a South American jungle. Some of the insects are bright green in color while others are bright yellow. If a new predator which eats these insects moves into the jungle, what will most likely happen to the populations of the green and yellow insects over time?

In a school science project, Henry and Nora are studying the similarities and differences between plant and animal cells. They learn that both types of cells contain mitochondria, cytoplasm, and a nucleus. However, they discover that some parts are found only in plant cells. For instance, one organelle in the plant cell allows it to produce a sugar called glucose. Which organelle is this?

This pedigree chart tracks albinism, a recessive condition which can result in individuals having no pigment in their skin. For this condition, Non-albino (A) is dominant to Albino (a). When is the phenotype of the offspring of individuals 3 and 4?

Spider crabs live on the ocean floor in shallow water. Greenish-brown algae live on the crabs' back, helping the crabs blend into their environment. Since the crabs move around, the algae get more exposure to sunlight which they need for photosynthesis to occur. What type of symbiotic relationship is this?

Cells were first observed and described by Robert Hooke in 1665 when he used a microscope to look at cork. His observations led to scientists developing the cell theory. This theory has changed over time as more data has been collected. Which of the following is NOT one of the main parts of the cell theory?

There are 4 parts of the cell labeled in the picture. The main function of each of these parts is also shown. In which of these would you find the cell's DNA?