What stars live the longest?
a. large-mass stars
b. average-mass stars
c. all stars live the same length of time
d. low-mass stars

They said i have got a sign of tuberculosis what should i do

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis