Lab5.pdf lab5.h

Explain how myelination of axons increases action potential conduction speed. There are 2 major mechanisms here. Explain both.

A rancher brings a group of cattle to a patch of temperate grassland to graze for a few days before moving on to a new area. When he returns a few months later, he notices that the grassland has several more species of sedges and flowering weeds than he remembered before, but the purple needle grass is still by far the most popular species. Which of the following statements explains the rancher’s observation?

Short Answer: Please answer ONLY one question from the following pair of questions about food webs OR the nitrogen cycle. 21.  Deciduous and boreal forests were cleared for agriculture in the NE USA during the 18th and 19th centuries but have since recovered. Forests are productive ecosystems with complex food webs. (i)    Complete the diagram of the wetland food web below by drawing arrows or providing a description that shows the possible directions of energy flow. The Sun!! (ii)    Explain why it takes many hectares of forest to support a pair of owls. OR 22. Nitrogen is an essential molecule in organismal proteins and nucleic acids. Fortunately, 78% of the atmosphere is composed of nitrogen gas. Unfortunately, none of this nitrogen is biologically available to you.      (i) Explain how nitrogen gets from the atmosphere into plant and animal tissues.     (ii) Florida is often deals with widespread toxic algae blooms, called Red Tides, that are causing mass fish kills in coastal marine ecosystems. Describe how human alterations to the Nitrogen Cycle could cause these algae blooms in waters off the coast of Florida.

The plate the Australian continent is on is moving relatively fast, at 68.5 mm/year.  How far has Australia moved since it was first inhabited by aboriginal people 65,000 years ago?

The spectra below is unknown.       Using the reference table below what element(s) are in the unknown spectra.     

外公今年七十二岁了。 他的个子挺高的，有一米七八（1.78米）。 他的性格内向，不爱说话，但他对人友善，很少发脾气。 外公说他年轻时做过美术老师，后来做过会计师。 退休以前，他是一家医院的院长。 外公从小就喜欢书法和国画。 退休后他还上了老年大学，专门去学书法和国画。 他说他的理想是举办个人书画展。   Question: 外公的个性怎么样？

At which time after clear-cutting does this exhibit the greatest species richness?    

  Question：他外婆一般去哪里买菜？

Fill in the blanks with the words. （Type Chinese characters） 又（yòu） 还是（hái shì） 太（tài ） 有点（yǒu diǎn） 了（le） 过（guò） 又（yòu） 对（duì）   妈妈不 [1]喜欢吃油炸食品。 这碗红烧牛肉面太辣 [2]，我要多喝点水。 我今天 [3]累，我想早点睡。 你要喝茶 [4]咖啡？ 妹妹 [5]花生过敏。 哥哥 [6]高 [7]帅。 你吃 [8]寿司吗？