A student wants to know if the weight of a cart affects its speed at the bottom of a ramp. He changes the weight of the carts by adding different numbers of balls, and he keeps the height of the ramp the same. What is his independent (test) variable?

The shape of the carts.

The angle of the ramp.

The weight of the carts.

The height of the ramps.

Which of the following would be least likely to support the modern concept of biological evolution? ( 2 points) a)different species of organisms with similar bone patterns b)different species of organisms with similar reproductive rates species in c)different domains with similar metabolic pathways species in d)different kingdoms with similar cellular structures.

1) strawberry plants typically reproduce by making runners, which are miniature versions of themselves, that grow off of the roots and stems of the parent. this type of vegetative reproduction is known as a) pollination. b) fragmentation. c) binary fission. d) vegetative propogation.

Aplant may open end close its stomata to prevent excess water loss and maintain