A possible explanation to a problem is a (n)

problem

observation

hypothesis

experiment

Mg + 2HCl → MgCl2 + H2 How many molecules

How does material move from the respiratory system to the circulatory system? answers?

How many grams are in one kilogram?

Active transport occurs in cells, for example, when the Na-K pump is at work. Any process that involves active transport most often involves the

Fast question! Tommy is planning his science fair project. He wants to measure the rate of photosynthesis in plants that live in fresh water.

1. Suppose that xylem were located only in the roots and stems of a plant. Would fluids in the xylem still move? Explain.

What activity will decrease body temperature? Sweating Exercising Adding clothing Shivering

Organisms with true radial symmetry A. tend to be highly mobile. B. do not have a distinct head region and tend to be sedentary or passive drifters. C. can be divided into two matching halves along only one plane. D.

1. The Earth's carbon cycle consists of the flow, cycling, and recycling of all of the carbon on the Earth. Every living organism's composition includes the element carbon. How does carbon become part of living organisms?

Which of these is used to find the precise age of a rock? Index fossils Radioactive dating Relative dating Stratified rock layers