Scientific investigations most often start from observations of the natural world and which of the following?
a) model
b) computers
c) variable
d) questions

What type of lipids are found in all biological membranes?

Sarah is sitting at the top of the slide in the schools playground. which will increase sarah’s kinetic energy a- an additional child is added to the top of the slide. b- sarah is pushed and moves down the slide. c- sarah climbs down the ladder and off the slide. d- the ladder is moved to the other side of the yard.

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.