BIOLOGY HIGH SCHOOL

What part of a wind turbine provides motion to convert into electricity?a. generator
b. blades
c. tower
d. rotor

Answers

Answer 1
Answer: There are twotypes of modern wind turbines. In a Verical-axis wind turbines (VAWTs), theshaft is mounted on a vertical axis perpendicular to the ground. They arealigned with the wind so there’s no adjustment necessary when the winddirection changes. It can’t start moving on itself that is why it needs a boostfrom its electrical system to get started. It uses wires for support so therotor elevation is lower. They are less efficient than HAWTs due to its lowerelevation. Lower elevation means slower wind due to ground interferences. Theother type is Horizontal-axis wind turbines (HAWTs), the shaft s mountedhorizontally parallel to the ground. It is constantly aligned with the windusing a yaw-adjustment mechanism. This mechanism moves the entire rotor left orright in small increments. It uses a tower to lift the turbine components to anoptimum elevation for wind speed and take up very little ground space. It ismuch more efficient than VAWT. The motion that converts into electricity is therotor. The answer is letter D.
Answer 2
Answer:

The answer is B. blades, I just took the test.

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What element has 81 protons in the nuclei of its atoms?

Answers

Tl = thallium

look at the periodic table look for element number 81 on the periodic table and that's TI

It's mass number is 204.38

identify whether the cells were plant cells or animal cells. Ella examined the slide under a microscope and concluded that the cells were plant cells. How did Ella reach her conclusion? Is her conclusion correct? What life process can these cells carry out that a cell from another kind of

Answers

Answer: Ella came to the conclusion the cells were a plant because plant cells are rectangular, and it has a central vacuole to store food and water, it would also contain a cell wall and a cell membrane. I think that Ella is correct if she saw all these things through her microscope. Plant cells contain an organelle called chloroplast, and this organelle has chlorophyll which supports photosynthesis. So yes, Ella is correct.

Cuckoo bird relationship with a warbler

Answers


Cuckoos are commonly known for brood parasitism, meaning that they lay their eggs in other birds' nests and leaving the unfortunate mother of that nest to care for the invader baby. Sometimes, the cuckoo would even remove the mother's eggs to ensure that the invader baby bird would get the most care and food.

So a cuckoo bird's relationship with a warbler would be that of parasitism. At the very least, it's harmful for the warbler.

All of the following are examples of voluntary muscle movement except_______? Heart beating

Leg kicking a soccer ball

Arm picking up a glass

Answers

Heart beating. Voluntary muscle movement means you decide to move the muscles (ie: you have to think about the movement). You don't have to think about your heart beating, it just does it on it's own.

Which is the largest organ of the human body? Lungs Intestines Skin

Answers

Answer:

Skin

Explanation:

Skin is the largest organ of human body. It makes the outer most covering of whole body. Since it makes the covering of whole human body, its average surface area in adult is known to be 1.8 meter squares. This makes it the largest organ of human body.

Skin is the part of integumentary system of human body.

Skin is the largest organ of the human body. :)

Levene made which contribution to our understanding of DNA structure? a. He determined that the nucleus contains DNA. b. He determined that DNA contains four nitrogenous bases. c. He determined that DNA consists of nucleotides. d. He determined that the nitrogenous bases of DNA are present in regular ratios.

Answers

Answer:

The correct answer is  b. He determined that DNA contains four nitrogenous bases.

Explanation:

Levene was an American biochemist who studied the structure of DNA in the early 1900s and in 1920 he found that DNA consists of four nitrogenous bases that are Adenine, Guanine, Thymine, Cytosine.

He also found deoxyribose sugar and phosphate group and said that nucleotide is the basic unit of DNA which contains a ribose sugar with attached nitrogenous base and phosphate group.

He also concludes that an equal amount of adenine, guanine, thymine, and cytosine makes the DNA which is now known as tetranucleotide hypothesis. So the correct answer is b. He determined that DNA contains four nitrogenous bases.  
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