PLZ HELP
Choose the best word to complete each sentence.

Worms are the simplest organisms that have a , which is made up of a knot of nerve tissue found in the . Worms also have organs that provide information about the environment, such as light, touch, or vibration.

The trp operon in e. coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses

What is the period of cell life when it is conducting