You run an experiment, exposing radish seeds to one of three treatments:   (left picture) Light, no water (center picture) Light, water (right picture) No light, water After 10 days you dry the material and get the following DRY mass data for each of the treatments. 1.46 g 1.63 g 1.20 g Describe what parts of the carbon cycle are occurring in each of the treatments: Treatment A photosynthesis [ans1], respiration [ans2] Treatment B photosynthesis [ans3], respiration [ans4] Treatment C photosynthesis [ans5], respiration [ans6] Treatment B weighs more than treatment A and C. Where did the extra mass in treatment B come from? [ans7] Respiration moves carbon from the [ans8] to the [ans9]

Given the biomagnification of PCBs what chemical characteristics do you expect PCBs to have?

The study suggest that the fundamental niche of the echidna is ____________ than previously reported.

Polychlorinated biphenyls (PCBs) are toxic chemicals that were widely used in manufacturing until they were banned in the U.S. in 1977. PCBs are very persistent in the environment and bind strongly to sediments, meaning that bottom dwelling and filter feeding organisms are likely to take in PCBs as they feed. PCBs accumulate in the fatty tissues and, to a lesser extent, muscle tissues of organisms. Examine the food web above. Which species do you predict would have the highest concentration of PCBs in their tissues?

How is the arc started when the contactor switch is in the remote position?

The face of a completed fillet weld should be flat or slightly convex.

If an overhead weld has porosity and the arc length is correct, increase the shielding gas flow rate.

Filler metal is usually similar to the base metal composition.

What does TIG stand for?

Grind marks should run around the diameter of the electrode.