Which era lasted from 542 to 251 mya

Two students are working together to Gram stain a mix of Gram positive and Gram negative cells. One of the students accidentally uses a bottle of water instead of ethanol during the decolorization step. How would this mistake alter their results? A.

3. Describe the functions of each of the eleven organ systems.

With what characteristic is shared by birds salamanders and sharks

How does a pathogen impact both the cardiovascular system and immune system?

RNA and DNA are both the instruction on how to create proteins, which then determine our specific traits. Where does DNA live in the cell? How is it packaged within the cell?

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.