Explain why humans need a circulatory system to transport oxygen, while single-celled organisms like the amoeba do not.

You are walking along and you see a plant that is small, green, and growing close to the ground. when you look more closely, you see it has a very flexible stem and leaf like structures that lack veins. you are most likely observing a (n)

What enzyme speeds up the breakdown of fats in food?

What is the kinetic energy of a 155 kg object that is moving with a speed of 18 m/s? With Details.

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor? Fp Ff FN Fg

Seaweed belongs to which of earths spheres? A. Atmosphere B. biosphere C. geosphere D. hydrosphere

Which of the following describes a relationship of commensalism? A. Oxpecker birds eat parasitic ticks off the backs of zebras B. The tapeworm latches itself in the intestines of a rat feeding off all the nutrients eaten by the rat C.

A substance directly involved in cellular communication within the human body

Scientists try to predict the location of major earthquakes based on which of the following? location of fault zones location of a mountain location of an ocean location of the science lab

What Are The Branches Of Botany?

Rocks, temperature, and water ARE what part of the environment