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Paladinen [302]
3 years ago
10

40 POINTS PLEZ HELP :)

Biology
1 answer:
Angelina_Jolie [31]3 years ago
4 0

2. To focus a microscope using the high power lens you must first in low power center the specimen and make sure it is in focus. Then switch to high power and adjust using the fine adjustment or the smaller knob.

3. It prevents dust from settling on the scope and in the lenses.

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What was the main result of the Persian Wars?
Zielflug [23.3K]

Answer:

The result was that Athens won the Persian wars and that they stopped Persia from conquering Europe. ... It preserved the Greek's independence and made sure that Persia did not conquer all of Europe. What were the Greeks able to use to win the Battle of Salamis? The Greeks used fast ships to ram into the Persian ships.

Explanation:

6 0
3 years ago
Rhizobium A. fix nitrogen inside nodules on the roots of legumes.B. resemble fungi.C. produce antibiotics.D. produce a gall in p
Marina CMI [18]

.Answer:

Option A, fix nitrogen inside nodules on the roots of legumes

Explanation:

Rizhobium bacteria live in symbiotic relationship with roots of leguminous plants such as pulses including alfalfa, soybean etc.

Rhizobium or Bradyrhizobium  is a gram negative bacteria that satisfies the nitrogen starvation of host plant.  

These bacteria get habitation and nutrition from these leguminous plants and in return they fix the nitrogen into the nodules of the roots. This is a kind of facultative association between soil bacteria rizhobium and legume plants.  

Hence, option A is correct

Thus, option A is correct

4 0
2 years ago
Describe four human activities that have negative effects on earth's ecosystems. how do human activities increase the occurrence
vova2212 [387]
There are a lot of human activities that gives negative effects on the earth's ecosystem but I will mention only four: Burning of things such as garbages or plants and trees, dumping of garbages anywhere, chemical substance that are being made and produced, cutting down of trees for replacement of buildings and homes. The human activities increase the occurrence of species extinction by doing this, it eliminates and destroy the homes of the species that are supposed to be living on their natural habitat. But instead of them, living peacefully, by doing these activities, their home will be destroyed that can kill them-- which can lead to extinction. 
4 0
3 years ago
A farmer wants to increase the amount of food produced by corn crops. If the farmer selectively breeds the plants, for which tra
Ainat [17]
To increase the amount of food produced by corn crops, the farmer could select for more cobs on the corn.
6 0
3 years ago
DNA wasn't definitively shown as the carrier of inheritance until which year?
Agata [3.3K]
It was not until the year of 1952!
6 0
3 years ago
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