What defines an ecosystem?

O living things

O the environment

both living things and the environment

The earliest organisms were completely heterotrophic in nature.

Describe one difference between apoptosis and necrosis?

A parent with freckles is crossed with a parent without freckles. The Punnett square shows the possible genotypes and phenotypes of the offspring. Which statement accurately describes the probability of phenotypes? A.

Reproductive isolation can result if two populations of an organism are separated from one another for a long time. If the populations are separated by a geographic barrier such as an ocean, mountain range, canyon, or river, this is called ... A.

Identify three of Earth's resources on which humans and other organisms depend for the long-term survival of their species

Which phrase defines a law? a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable A statement of fact that is generally accepted to be true and universal because it has always been

Which vessels allows for oxygen movement into the tissues

What is the difference between a physical and a chemical change

What is described by binary fission? A) The way prokaryotes move. B) The way prokaryotes produce energy. C) The way prokaryotes reproduce. D) The way prokaryotes digest nutrients.

There are many different ecological and environmental conservation methods. Which is not a conservation method? A) water harvesting B) fishing seasons and limits C) limiting of clear cutting of forests D) wind and wave erosion on coastal areas