the diffusion of substances across a cell membrane from an area of low concentration without the use of energy

Items such as sheet metal, treated lumber, corn syrup, and plastics are examples of

What causes plants to respond positively to sunlight?

Which part of an ecosystem would be hurt if humans overhunted an herbivore

Choose the ingredients needed for nuclear fusion. Check all that apply. a. Energy b. Helium Gas c. High Tempatures d. Hydrogen Gas e. Low Pressures

Which of the following factors would decrease hemoglobin's affinity for oxygen? A. an increase in P02 in surrounding tissue B. a decrease in the acidity of the interstitial fluids C. a decrease in the pH of the interstitial fluids D.

1 pts A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed.

How do I get the answers for the insect identificationusing the dichotomous key?

How do earthquakes, volcanic eruptions, Floods, landslides, Hurricanes, and tornadoes affect the oceans, the land and the environment?

Which are early (prodromal) clinical manifestations of hepatitis? a. fatigue, fever, hyperalgia, and vomiting b. light-colored stools, dark-colored urine c. large, tender liver; itching; jaundice d. pain in the left upper quadrant, splenomegaly?

If you were a paleontologist, which species would you expect to find first in the fossil record? a. Horse b. Plant c. Frog d. Shark e. Chicken