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NikAS [45]
3 years ago
9

Which piece of evidence do scientists refer to back their idea that life-forms have changed (or evolved) over time?

Biology
1 answer:
Akimi4 [234]3 years ago
7 0

In older rock layers we find fossils of living things that no longer exist on earth.

Explanation:

Scientists often refer back to fossils found within sedimentary rocks to back their idea that life forms have changed over time.

Fossils are the preserved remains of organisms that once lived on earth. Special conditions must be in play before an organism can become a fossil like presence of hard parts.

  • Fossils are indicators of ancient life forms that has once lived.
  • They provide us with important clues to the nature of organisms that existed in time past.
  • Using phylogenetic relationship with their present day ancestors, it is possible to trace the evolutionary history of a specie.

Learn more:

Evolution brainly.com/question/6912833

Fossil brainly.com/question/12790206

#learnwithBrainly

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The greater the concentration of sulfur and nitrogen oxides, the higher the pH of precipitation. True False
OLEGan [10]

False

Nitrogen and sulfur dioxide are acidic oxides in nature. The burning of fossil fuels and other sources are responsible for addition of these oxides in the atmosphere of earth. These oxides mixed with water vapor causes acid rain. Being acidic in nature they will have low pH value. Therefore, greater the concentration of sulfur and nitrogen oxides, will lower the pH value of precipitation.

hope this helps:)sorry if it doesnt

6 0
3 years ago
Read 2 more answers
A plastic bottle contains 32.5 L of gas at a pressure of 45.7 kPa and
Monica [59]

Answer:

Final pressure, P2 = 362.26 kPa

Explanation:

Given the following data;

Initial volume = 32.5 Liters

Initial pressure = 45.7 kPa

Final volume = 4.1 Liters

To find the final pressure, we would use Boyle's law;

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

PV = K

P_{1}V_{1} = P_{2}V_{2}

Substituting into the equation, we have;

45.7 * 32.5 = P_{2} * 4.1

1485.25 = 4.1P_{2}

P_{2} = \frac {1485.25}{4.1}

P_{2} = 362.26

Final pressure, P2 = 362.26 kPa

5 0
3 years ago
Describe the structure of a typical bone
Paladinen [302]

Answer:

The outside of the bone consists of a layer of connective tissue called the periosteum. Additionally, the outer shell of the long bone is compact bone, then a deeper layer of cancellous bone (spongy bone) which contains in the medullary cavity the bone marrow.

7 0
3 years ago
Mention four ways to keep your environment clean​
leva [86]

Answer:

Recycle, Drive your car less, Save water, and Save Electricity

Explanation:

8 0
3 years ago
Evidence suggests that first, ____________ were acquired when an aerobic bacterium was engulfed by larger cells and became mutua
leonid [27]

Answer:

1. Mitochondria

2. Chloroplast

3. the formation of eukaryotic cells

4. DNA

Explanation:

The theory of endosymbiosis was proposed by the Lynn Margulis in 1967 which suggested that the eukaryotic organelles like the mitochondria and chloroplast evolved when another prokaryotic cell engulfed the prokaryotic bacteria.

The mitochondria were formed when the chemosynthetic bacteria were engulfed by the bacteria and the engulfed bacteria formed a symbiotic relationship. Similarly, the chloroplast was originated in the same way when the photosynthetic bacteria were engulfed by another prokaryote.

The evidence which supports their ar:

1. The same size of the organelles to the bacteria

2. The presence of the circular DNA of the organelles like bacteria  

3. The similarity in the 30s and 70s ribosomal subunits.

7 0
3 years ago
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