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:

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:

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:

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:

After hatching from its egg, the young monarch exists as a caterpillar, eating leaves voraciously before it can eventually transform into a butterfly. In this early, immature stage of its life cycle, the organism is a:

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:

A pea plant can have a gene for seed color, but that gene might come in two different versions: one for green and one for yellow. Each specific version of a gene is called an:

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

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:

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:

Over thousands of years, the rushing water of the river slowly wore away the rock, carving out a deep canyon and carrying the sediment downstream. This process of wearing down and moving earth materials is:

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:

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