While most sunflowers in the field had yellow petals, a random change in the DNA sequence of one seed caused the resulting flower to grow bright red petals. This permanent alteration in the genetic code is a:

By studying fossil records and DNA, scientists found that modern birds evolved from a specific group of small, feathered dinosaurs. This extinct organism from which the modern group descended is their:

In a snowy environment white rabbits are less likely to be seen by predators than brown rabbits. Over many generations, the white-furred rabbits survive & reproduce more, causing the population to shift toward white fur

The island can only provide enough food and water for 500 deer. If the population grows beyond that number, many will starve until the population returns to a level the environment can support. This maximum limit is the:

In order to produce specialized cells for reproduction that have only half the original number of chromosomes, an organism undergoes a specific type of cell division called:

Earthworms and lobsters have bodies that are divided into a series of repeated, distinct parts or sections, allowing for more specialized movement and organ placement. This structural body plan is known as:

In humans, the sperm and the egg are specialized reproductive cells that join together during fertilization. These "sex cells" are scientifically known as:

A young bird hatches with the same unique beak shape and feather color as its parents because the genetic information was passed down through their DNA. This transfer of traits from one generation to the next is:

In the desert and along the coastline, the wind blows loose sand into large, shifting mounds or ridges of sand. These formations are called:

A tropical rainforest contains thousands of different species of plants, insects, birds, and mammals, making it much more resilient than a farm that only grows one type of corn. This variety of life in an ecosystem is:

When a human body becomes too hot, it produces sweat to cool down; when it becomes too cold, it shivers to generate heat. This internal balancing act to maintain a stable environment is called:

When you scrape your knee, your skin cells must divide to create two identical "daughter" cells to replace the damaged tissue. This type of cell division for growth and repair is: