Approximately when did the first plants and arthropods appear on land? A. 444 Ma B. 488 Ma C. 299 Ma D. 416 Ma

You have decided to test the effects of five garden fertilizers by applying some of each to five separate rows of radishes. what is the variable you are testing? what factors should you control? how will you measure the results?

A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 3.00 atm. The expansion does 235 J of work on the surroundings. What is the final volume of the cylinder?

Which of the following substances are not homogeneous mixtures? A. Gold Ring B. Spaghetti Sauce C. Cane Sugar D. Window Glass E. River Water F. Bottled Water

What chemical element each period ends with?

How does water get to the leaves in the top of the tallest trees against the force of gravity?

What are the five types of chemical reactions?

Which chemical reaction do plants use to take carbon dioxide out of the air

What are the primary elements of the earths layres?

How long does it usually take fir a rock to undergo a stage within the rock cycle

Calculate the ph of a solution formed by mixing 150.0 ml of 0.10 m hc7h5o2 with 100.0 ml of 0.30 m nac7h5o2. The ka for hc7h5o2 is 6.5 * 10-5.