Which of the following will a highly developed country likely not possess?
A. a high GDP
B. a low literacy rate
C. clean drinking water
D. a high life expectancy rate
Please select the best answer from the choices provided.

A
B
C
D

Which property of soil depends on the size of particles? color odor temperature texture

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

5. what is a red giant? can our sun become a red giant? why or why not?