The capillaries that wrap around each muscle fiber are located within the .

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?

List the four types of organic compounds found in all living things and explain why they are important.