When the sun produces energy, it consumes hydrogen and produces

A radium

B helium

C nitrogen

D chromium

An organisms haploid number of chromosomes is 40 what would be this organisms diploid number

According to the nebular hypothesis, when did nuclear fusion begin?

The stage of the cell cycle in which the cell performs its normal functions and prepares for cell division is called:

Which phylum is most closely related to the arthropods?

Which of the following is not a theory supporting global warming?

Which option is an advantage to using a parallel circuit? A. Parallel circuits use less wire. B. If one bulb goes out the others stay lit. C. Parallel circuits are a complex circuit.

Which protective covering of the brain provides passageways for cerebrospinal fluid (CSF) to drain into the superior sagittal sinus? a) arachnoid mater b) periosteal part of the dura mater c) membranous part of the dura mater d) pia mater.

Match each product of pyruvate metabolism with the condition under which it is produced.

Which of the following best describes calcitonin? A. It's released by the adrenal medulla. B. It's released by the parathyroid gland. C. It functions to prevent hypercalcemia. D. It functions to prevent hypocalcemia.

Smooth muscles are slow to relax and slow to contract. explain why this is and why this is important.