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antoniya [11.8K]
3 years ago
14

Help plsss

Biology
1 answer:
Margarita [4]3 years ago
7 0

Answer:

Fluorine is a chemical element with symbol F and atomic number 9. Classified as a halogen, Fluorine is a gas at room temperature.

symbols are abbreviations used in chemistry for chemical element

Explanation:

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1. What does it mean to be living?
Sergio [31]

Answer:

1. It means to have the charatersitcs of life which is the ability to reporoduce as a species, ability to adapty, use energy, homeostasis, have the ability to grow and develope, and use or give off some sort of energy.

2.

A. Living

B. Non-living

C. The fungi on athletes foot is living.

D. Non-living considered a virus (needs a host to be living)

8 0
2 years ago
What happens when nutrient levels become too concentrated in rivers, lakes, and oceans?
Reika [66]

Answer:

Eutrophication is what happens when nutrient levels become too concentrated in rivers, lakes, and oceans. Eutrophication is when the levels of nutrients and minerals in a body of water become too concentrated. It is usually induced by the release of nitrate or phosphate-containing substances into a water body.

Explanation:

3 0
3 years ago
The Hardy-Weinberg equation is used to determine the frequency of which alleles in a population?
Zigmanuir [339]

Answer:

i think the answer is a

Explanation:

the Hardy-Wienberg principle is used to explain the unchanging frequency of alleles and genotypes

5 0
3 years ago
To stimulate muscle contraction acetylcholine is released from the
Debora [2.8K]

Answer:

motor neuron

Explanation:

4 0
3 years ago
How long will it take for 40.0 grams of Radium-226 (Ra-226) to decay to leave a total of 2.5 grams of Ra-226? Ra-226 has a half-
kolezko [41]

Answer:

6400 years

Explanation:

Given that;

N/No =(1/2)^t/t1/2

No = amount of radioactive material originally present

N = amount of radioactive material present at time t

t= time taken for N amount of radioactive material to remain

t1/2 = have life of the radioactive material

2.5/40 = (1/2)^t/1600

1/16 =  (1/2)^t/1600

(1/2)^4 = (1/2)^t/1600

4 = t/1600

t = 4 * 1600

t = 6400 years

3 0
3 years ago
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