I need to know two structures that allow arthropods to breathe air?

The scientist (scientists) who showed that dna contained equal amounts of certain nitrogen bases is (are)

Two adaptation that allow zebras to avoid their predators

What materials formed the solar system?

The figure below shows feeding relationships among some organisms in an ecosystem. According to the evidence, which resource are some of the organisms competing over?

What part of the cell theory relates to cell division and ferilization?

Which of the following is a feeding source for fens? aquifers dexfoliants exfoliants nitrates

What system includes oceans, lakes, rivers, and groundwater? a. geosphere b. hydrosphere c. atmosphere d. biosphere

Fungal spores a. are only asexually produced. b. cannot be seen in a light microscope. c. are used to identify fungi. d. are produced by molds but not by yeasts. e. are only produced under harmful environmental conditions

Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm.

What's the function of rough er