2. Describe the overall trend in corn yield from 1988 to 2008. How does the trend in corn yield during that time compare to trends for total nutrients and nitrogen?

Explain the importance of producers, primary consumers, secondary consumers and decomposers in an ecosystem.

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

If the coding part of an mrna molecule is 1800 nucleotides (bases) in length, this molecule will contain codons and code for a polypeptide that is amino acids long.