Which of the following was most likely not present in creating the amino acids of early earth's waters of the past

The cardiovascular system, which transports blood through the body, is a one-way system. select the best answer from the choices provided. t f

Minute vessels that collect blood from the capillaries and join to form veins are: venoles venules viscera venoids

Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition select the best answer from the choices provided