Construct an argument supported by empirical evidence that changes to physical or biological components of an ecosystem affect populations.

  1. Ecosystems

    Scientists say: Biomagnify

    Chemicals in the environment can build up in an animal’s tissues. Predators who feed on these animals can accumulate more and more of the pollutants, a process known as biomagnification.

  2. Animals

    Picture This: Winter brings white noses

    White-nose syndrome, caused by a fungus, has killed millions of bats in the eastern United States. Now, scientists show that the disease comes and goes, by season. The finding could help scientists more effectively target any treatments.

  3. Environment

    Spidey sense: Eight-legged pollution monitors

    Spiders that prey on aquatic insects can serve as sentinels that naturally monitor banned chemicals that still pollute many rivers across the United States.

  4. Microbes

    How ‘bugs’ in our bellies impact our health

    Gut bacteria can play a powerful role in human health, new studies show. In one, bacteria turned a nutrient in red meat into a chemical that boosts the risk of a heart attack. Another study shows that our genes play a role in whether we are fat or thin, probably by affecting which bacteria prefer to live in our intestines.

  5. Food can make an appetizing science fair project

    Many students think they need a laboratory or special equipment for a winning research project. But finalists at the Broadcom MASTERS competition showed food-based research may require little more than your home kitchen

  6. Health & Medicine

    Explainer: What is Ebola?

    A virus is behind the hemorrhage-inducing infection called Ebola. It causes fevers and often intense bleeding — seemingly from anywhere and everywhere.

  7. Environment

    Bug-killer linked to decline in birds

    One of the most popular chemicals used to protect crops from bugs may also take a toll on birds, a Dutch study finds. U.S. farmers also rely on these insecticides, a second study finds.

  8. Animals

    Teen shows salty lionfish are getting fresh

    Lauren Arrington kept spotting lionfish in rivers near her Florida home. Her science fair project probed how much fresh water these ocean fish could stand — and led to a published research paper.

  9. Animals

    Salted butterflies

    The salt used on winter ice can alter the bodies of summer's butterflies. Males develop larger muscles and females get bigger brains.

  10. Animals

    A library of tweets (and howls and grunts)

    The Macaulay Library houses a world of animal sounds. And now anyone with an Internet connection can check out this audio collection.

  11. Environment

    Native ‘snot’

    The ‘rock snot’ choking rivers may be native algae. Experts blame its sudden and dramatic emergence on changes in Earth’s atmosphere, soils and climate.

  12. Animals

    Teen studies water strider disappearing act

    As a child, Xidian Zhang loved to play with water striders. Now they’re gone, and pollution may be the reason. This teen’s findings earned him a spot at the 2014 Intel International Science and Engineering Fair.