Which structures contain dna within the cell nucleus? a. organelles b. chromosomes c. ribosomes d. proteins

What does it mean for a cell membrane to be selectively permable

Cells in organisms need food, air, and waste removal. how are these needs met? a. cells get their food from the air and sunlight around them. b. organs and tissues perform these functions for the cells. c. cells share their waste with other cells. d. each cell must specialize in all of these functions.

Using the graph, determine the half-life of thorium-232. question 12 options: 7 billion years 14 billion years 28 billion years 35 billion years