The flow of energy through living systems can be modeled as food chains, food webs, or energy pyramids. The energy organisms need to live and grow first enters the ecosystem when which of the following occurs? 1.Plants take in light energy from the sun. 2. Decomposers break down dead organisms 3.Primary consumers eat plants for food 4. Secondary consumers eat primary consumers

It's #1

Explanation:

This is because plants are the very first on all the things listed above ( food chains, food webs, and energy pyramids) and then continue to be eaten and adding the energy in the process.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

true is the final answer!