Which of the following are primary lymphoid organs?

a. bone marrow and thymus

b. appendix and spleen

c. lymph nodes and tonsils

d. spleen and thymus

Specialist in the genitourinary system of males and the urinary system of females

Which division of the human system is responsible for maintaining body temperature

The type of diabetes which accounts for 90-95 of all cases is

Using data, provide evidence that evolution is an ongoing process.

While at the shore, you and your friend Maria find a nest containing the fossilized remains of an animal. The nest, covered with sand, contains a skeleton and six preserved eggs. Maria believes you have discovered a bird nest.

Discuss why scientists know so little about Precambrian Earth

If two elements are in the same chemical family then what can be predicted about their Spectra

Which feature cause a gap in the geologic record a. extrusion b. fault c. intrusion d. unconformity

Which of the following correctly describes a way in which Earth's atmosphere interacts with the geosphere? It contains gases that living organisms breathe. It contains gases that trap incoming solar radiation.

Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago? multiple choice dinosaurs stromatolites trilobi?