How does nitrogen enter the biotic part of the ecosystem?

How to reduce swelling on back of hand in the middle?

Which best describes the cell theory? 1. Scientists know all there is to know about cells, so the cell theory will not change. 2. As technological advancements are made, the cell theory may change. 3. A theory, once formulated, cannot be changed. 4.

A scientist doing reasearch found that flower color and pollen shape were traits that were always passed together. That is they did not fit mendels rule for independent assortment. Why might that be?

Lionel uses a model that includes the atmosphere and sunlight to predict Earth's temperatures. In this model, why does increasing the levels of carbon dioxide in the atmosphere cause temperatures to increase? A.

Which of the following can limit the growth of a population of organisms

A molecule is involved in a chemical reaction causing the arrangement of it atoms to change. What is the result of this process?

What is an adaptation? why must organisms adapt? why are there different adaptations? Use and example to explain all your answers

An annual plant bears fruit or flowers every year. a. True b. False

A scientific theory must be supported with empirical evidence. True or False

For evolution to be occurring, natural selection must also be occurring. a. True b. False