The double layer of fibrous tissue surrounding the heart is the

Which abiotic factor is the primary source of energy for all organisms

What african animal was nearly made extinct by the demand for its body parts for european leisure products? a. tiger b. elephant c. giraffe d. lion

Which process will decrease the level of CO2 in the atmosphere? growing trees cutting trees burning trees increasing the human population

Which of the following is true about acute and chronic disease? A) Chronic diseases appear rapidly, while acute diseases are always present in a population. B) Acute diseases appear, decline or disappear, then never reappear.

Where would ciliated epithelial be found? where would ciliated epithelial be found? in the trachea in medium-sized veins in the gi tract in the kidneys?

Maryland white oak trees make their own food. Their cells contain structures that capture energy from the sun. What are these structures?

What are two ways in which all living things are similar at the molecular level.

Which of the labeled structures controls the water balance in the paramecium?

Paleontologists can definitively conclude whether dinosaurs were endotherms. a. True b. False

What is thethe protein-assembly factories of the cell, are present in prokaryotic cells, animal cells, and plant cells.