How does a toxin enter the cell membrane?

Which are observations about the tree on the right ,? check all that apply

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.