What advantages did using the elodea stalk have over using its leaf or leaves?

What is thought to have contributed to the evolution of eukaryotes?

Which of the following describes an aspect of fetal circulation that does not occur in adult circulation? Both oxygenated and deoxygenated blood use the umbilical artery. Both oxygenated and deoxygenated blood use the umbilical vein.

According to the theory of biological evolution, most present-day species of organisms (1) developed from similar, smaller prehistoric organisms (2) have always existed in the form they have today (3) developed from fossils of the other organisms

If you had a genotype of 'tt', what would your phenotype be? Short Tall

Why is the side of the Earth facing the moon pulled harder than the side facing away? Because the side of the Earth facing the moon is farther from the moon. Because the side of the Earth facing the moon is closer to the moon.

During the last century, both global temperatures and men's average height have increased. Do these correlated trends mean that the increase in men's height caused the increase in global temperature? yes ___ no ___ Explain why or why not.

Describe the different types of fossil fuels. What makes them nonrenewable?

As the number of rabbits in a community goes up, the number of foxes in the same community goes up. What type of relationship is this?

Which of the following locations would most likely have the most fertile soil

What are dna composed of?