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Andreyy89
2 years ago
10

30 POINTS ASAP

Biology
1 answer:
Helen [10]2 years ago
7 0
Scientist combine-several well-tested techniques to find out the ages of fossils. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actual ages of certain types of rocks to be calculated. There is no way to calculate an "absolute" age. Relative Dating. 
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Surgical removal of parts of the brain to determine their function relies on a technique called
Lelechka [254]
Pretty sure answer is <span>ablation</span>
5 0
3 years ago
In a population of 100 four o’clock plants, there are 50 red-flowered plants with genotype CRCR, 30 pink-flowered plants with ge
Misha Larkins [42]

Answer:

a- CRCR frequency = 0.5

b- CRCW frequency = 0.3

c- CWCW frequency = 0.2

d- CR frequency = 0.65

e- CW frequency =  0.35    

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
3 0
2 years ago
When a nerve cell is stimulated, the cell membrane becomes ______ permeable to _______?
mel-nik [20]
Hey You!

I believe these are the answers:

Blank 1 = More.

Blank 2 =Sodium.

(Quite sure these are correct).
7 0
2 years ago
Read 2 more answers
Please help!
Gala2k [10]

Tundra and deserts are two biomes of the world which represent the extreme form of climates. Tudra is the coldest region of the earth while desert represent the hottest zones of the earth. But whats  the most common thing in these extreme zones is that they receive very less precipitation throughout the year (less than 25 cm).

Therefore, flora of the desert and Tundra have some special adaptations to survive without sufficient amount of water.

Let's see what are those:

  • Tundra:
  1. The height of plants growing in Tundra is very less like lesser than 1 foot. The short structure of the plants helps them to get more heat from the dark soil and helps to survive freezing. The short height lets them stay protected from harsh effects of cold or snow.
  2. The plants in tundra grow in groups or clumps that helps them in surviving the attacks of ice particles or snow balls. For example: lousewort and Arctic crocus.
  3. Some flora of tundra has ability to grow even in the complete lack of water for several years.This is because they have waxy layers that cover the leaves and store maximum water for the periods of no availability.
  4. Some plants have hair on the surface of stems that trap maximum heat and protect the plant from heat and extreme forms of wind. For example: Arctic crocus.
  • Desert
  • Desert plants not only have physiological but also morphological adaptations to survive heat stress and shortage of water. Their stems, roots and leaves are fleshy and help them to store water for a large period of time. For example: Cactus
  • Many desert plants like <em>xerophytic bromeliads</em> and <em>epiphytic orchids </em>contain a system alternate of photosynthesis called CAM (Crassulacean Acid Metabolism). This process helps the plant to open the stomata at night for exchange of gases and accumulate CO2. In day, stomata are closed and the CO2 is used for photosynthesis. This is an adaptation, because during night when temperature is low, CAM plants lose less water as compared to what normal plants lose during day.
  • Some plants have extremely large roots that absorb maximum water from soil and compensate the plant's loss of water due to heat. For example: Phreatophytes.
  • Some Perennial plants  have adapted the mechanism to stay in condition of rest or dormant during extreme heat. They get back to normal life when weather become a bit better.

 Hope it helps! :)



8 0
3 years ago
Which of the following includes two types of cells
creativ13 [48]

Answer:

B.

Explanation:

hope this helped

stay safe

brainliest is appreciated only 1more to level up please help :)))

8 0
3 years ago
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