Which characteristics accurately describe earthworms? Check all that apply.

segmented body containing setae

open circulatory system

gas exchange through gills

complex nervous system

sexual reproduction

Scientists observed some fossils of the early ancestors of camels. Using the fossils they obtained, they prepared a phylogeny chart for camels.

What is the function of a valve?

When Mendel's first generation pea plants were allowed to self-pollinate, the ratio of tall (dominant) to short (recessive) plants in the second generation was A) 1:1. B) 1:3. C) 2:2. D) 3:1.

What is another analogy for describing the difference between prokaryotic cells and eukaryotic cell?

1. Which of the following gene is responsible for an amino acid synthesis in YAC vector? CEN URA3 ARS TRP1

Why should people not make changes in their diets based on the results of a single research study? What can you do to increase fiber in your daily food choices?

Animals that take in oxygen from their environment, glucose is broken down into carbon dioxide and water in a process called

2 Apply Scientific Reasoning What are some possible reasons a cell might not be able to create and deliver all the protein it needs? Come up with at least four potential reasons and discuss specific cell structures and their functions

What is likely the greatest cause of species extinctions this century

What is an ecological system consisting of all of its biotic and abiotic factors? A) community B) ecosystem C) habitat D) pure culture