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3 years ago

Which is a reason that many organisms that have existed on earth have left no fossils?

Biology

2 answers:

telo118 [61]3 years ago

8 0

Many organisms live only in rainforest.

APEX

lozanna [386]3 years ago

5 0

A lot of the organisms that have existed on earth have left no fossils because of the incredibly specific set of requirements for a fossil to form. First, it must settle into sedimentary rock, instead of being roasted to nothing else but carbon fragments from the formation of igneous rock, or be crushed and burned from the formation of metamorphic rock. Then, the conditions of the surrounding environment must be just right: high sedimentation rates, low soil acidity, lots of minerals and anoxic conditions are best. Also, the organism must have bones or some kind of material that can easily mineralize into a fossil.
An outlier would have been the organisms from the Cambrian period, which were fossilized at a high rate despite being mostly millimeter to centimeter long soft-bodied organisms. We have recently found out that this is due to the thick algal mats at the bottom of the Cambrian oceans. You can actually go see the Cambrian fossils at the Burgess Shale.

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Compare and contrast DNA and RNA

Ierofanga [76]

Compare: both RNA and DNA have 3 nitrogenous bases: Adenine Cytosine and Guanine. Also both have a phosphate groups in their nucleotides

Contrast: RNA is a polymer with a ribose AND a phosphate backbone. It has four different nitrogenous bases: adenine, guanine, cytosine, and uracil.

DNA is a long polymer with deoxyriboses AND phosphate backbone. It also has four different nitrogenous bases: adenine, guanine, cytosine and thymine.

Hope this helps

6 0

3 years ago

Which of these factors would most likely strengthen the effectiveness of

KIM [24]

B political interests

8 0

2 years ago

Read 2 more answers

With a suitable diagram explain reflex action and reflex arc

vampirchik [111]

Reflex action in the diagram would be the response. Diagram extracted from online.

5 0

3 years ago

In the area near an old copper mine,no plant grow. Go further away more and more plants are growing. An analysis of the soil nea

maks197457 [2]

Plants do not grow near the old copper mine because of the excess copper deposited in them impairs cellular processes and inhibits plant growth.

What are micronutrients?

These are required by plants in much smaller quantities less than 1% of the dry weight but are necessary for growth and development. There are 7 essential plant nutrients like boron (B), zinc (Zn), manganese (Mn), iron (Fe), copper (Cu), molybdenum (Mo), and, chlorine (Cl).

Copper activates some enzymes in plants that are involved in lignin synthesis and are required in the process of photosynthesis.

Excess copper causes reduced seed germination, low shoot vigour, and lower iron availability. A deficiency of copper can lead to increased to susceptibility to diseases like ergot, which can cause significant loss in the yield.

Plants growing in the old copper mine have the excess deposition of copper in one place which affects the germination of seeds hence it is found difficult to grow in the old copper mine.

Plants can grow easily in a place that is further away from the old copper mine. Because there is a high concentration of copper dissolved in water in the soil, this helps the plant to grow by exhibiting the photosynthesis process.

Learn more about micronutrients from the link given below:

brainly.com/question/7411332

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6 0

9 months ago

The solutions in the two arms of a U-tube are separated by a membrane that is

IgorC [24]

Answer:

See the answer below

Explanation:

Recall that: Water potential = pressure potential + solute potential

Since the system is an open one;

Water potential = solute potential = -iCRT

i = number of particles the molecle will make in water (1)

C = molar concentration

R = Pressure constant = 0.0831 liter bar/mole K

T = temperature in kelvin = 22 + 273 = 295 K

To calculate water potential on side A:

C = 1 M

Water potential = - (1 x 1 x 0.0831 x 295) = -24.51 bars

For side B:

C = 2 M

Water potential = - (1 x 2 x 0.0831 x 295) = -49.03 bars

Since side A has higher water potential than side B, water will flow from side A to side B until equilibrium is established between the two sides. Water always flows from the region of higher water potential to the region of lower water potential.

6 0

2 years ago