Jerry is conducting an experiment to test friction. his setup is shown below. if he wants to test the fiction between different types of
materials , what should he change in the setup above?
mass
wooden block
spring scale
string

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

Some substances but not other can cross the (blank) membrane of a cell