The Sun's mass is 19.89 × 1029 kg. Which of the following is the best estimate of the Sun's lifespan? A.
500 million years, or 0.5 billion years
B.
1,000,000 million years, or 1 trillion years
C.
10,000 million years, or 10 billion years
D.
100,000 million years, or 100 billion years

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

Apatient has an open displaced fracture of the second cervical vertebra. this is her fifth visit and the fracture is healing normally. what icd-10-cm code is reported?

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast