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stepan [7]
3 years ago
15

How are Protista different from Bacteria?

Biology
1 answer:
icang [17]3 years ago
6 0
<span>How are Protista different from Bacteria?

</span>
<span>A)Protista have nuclei and Bacteria do not. </span>
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What percentage of species do scientists predict we will drive to extinction by the year 2100?
Dovator [93]

Answer: 50%

<span>Life on Earth appears to be on its way to extinction because of the carbon being pumped into our atmosphere.</span>

<span>Biologists reported that one in five species on Earth show signs of extinction, and unless urgent action is taken to save the planet’s biosphere, </span><span>scientists predict that  50% of species will be driven to </span>extinction by the year 2100.

<span>.</span>

7 0
3 years ago
3. The two strands of a DNA molecule are held together by...
Alborosie
The answer is B. Hydrogen Bonds
4 0
2 years ago
Flexible connective tissue found in the immature skeleton, epiphyseal plate, and on joint surfaces is called_________
Lesechka [4]
Answer: Cartilage

Hope this helps:)
7 0
3 years ago
Describe the four stages of the hypothesis for the origin of life on earth by chemical evolution
VashaNatasha [74]
It would be nice to see the 4 stages titled to have a clue to what they could be. You see, chemical evolution is a myth, like Darwin's "warm little ponds." There are no naturalistic processes that have any power to accomplish the complex, diverse, extensive and highly non-entropic assembly of biochemical elements, molecules and assemblies into even the simplest life.

There is no primordial soup, panspermia is a distraction, none of the intractable issues for the origin of life.

Logically, the first step is collection of all elements, second, first level assembly of amino acids lipid membranes, proteins, third, higher level combination of biochemical molecules and generation of nucleotide coded DNA containing the processing code for generation and production of RNA, enzymes ribozymes and all other cellular functions, then fourth, the execution of all metabolism, nutrient collection, waste elimination and reproduction consistent with a living organism. Admittedly speculative since chemical evolution is a myth.
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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