Most energy enters ecosystems in the form of sunlight.

a. True

b. False

In vertebrates, what joins the brain to the rest of the body? a. spinal cord b. medulla oblongata. c. vertebral column d. peripheral nervous system

If a change in the body causes more change in the same direction the system is called

What is the energy source for the hydrologic cycle?

What is a homogeneous, generally clear jelly-like material that fills cells.

Classify each nutrient as a macronutrient or as a micronutrient. Macronutrients / Micronutrients protein vitamin A carbohydrate phosphorous sodium fat

A sedimentary rock is found to be 300 million years old. Which type of organism is NOT likely to be found in the rock? a) insects b) mammals c) fish d) land plants

James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box.

What holds DNA and controles cells activities

Usually, a mutation in the promoter region of an operon causes reduced levels of synthesis of the proteins encoded by that operon. Occasionally, a mutation in the promoter region actually causes increased levels of synthesis.

Genes do not exert the only influence on personality. therefore,: