Whats a pure substance that cant be broken down into simpler substances by chemical or physical means

A researcher observing an ecosystem describes the amount of sunlight, precipitation, and type of soil present. Which factors is the researcher most likely describing?

Whatcan adapt to changes?

What would happen to an enzyme if the temperature and pH changed significantly beyond the enzyme's optimum level?

The ovaries are part of the endocrine system.

What would you use to detect the presence of electric charges?

Which best describes oogenesis and spermatogenesis?

What is one thing that all types of asexual reproduction have in common?

How is a dog similar to a baseball player?

What experimental evidence leads scientists to believe that only quantized electronic energy states exist in atoms?

With which atoms does carbon most frequently bond