Some species of penguins, such as chinstrap penguins, depend on open water for their survival. Other species of penguins, such as adelie penguins, depend on ice. Over the last 20 years, the population size of chinstrap penguins has increased, and the population size of adelie penguins has decreased. Which of the following most likely caused these changes in population size?.

Which two statements are true about a system? 1. a system is a group of objects analyzed as one unit. 2. energy that moves across system boundaries is conserved. 3. there’s only one way to define the boundaries of a system. 4. all systems are made by humans.

Which statement summarizes how the chart illustrates the author position on ethanol

Afood web shows who eats who in any given habitat. every living thing, from one-celled algae to giant blue whales, needs food to survive. each food web is a possible pathway that energy and matter can follow through the habitat. a food web begins with producers: organisms that convert sunlight into usable chemical energy. the food web is completed by the decomposers who turn organic wastes, such as decaying plants, into inorganic materials, such as nutrient-rich soil. decomposers complete the cycle of life, returning nutrients to the soil or oceans for use by producers. in this food web, identify the decomposer.