How many braincells do I have?

Sienna made a chart listing characteristics of two kinds of echinoderms. Which headings correctly complete the chart? a. X: Sea Urchins Y: Brittle Stars b. X: Brittle Stars Y: Sea Urchins c. X: Sea Cucumbers Y: Brittle Stars d.

Which chemical formula is a carbohydrate? a) C3H7O2N bC12H22O11 c) CO2 d) CH4

2. What does an animal need to survive and grow?

Why does water resist temperature change

Hemoglobin from two species is compared. On the long protein chains, there are three locations where the amino acids are different. Where would you place the common ancestor of the two species on the "tree of life," and why?

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.