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slavikrds [6]
3 years ago
12

The graphic shows the island of Krakatoa, which disintegrated in 1889, due to the largest volcanic eruption in recorded history.

In the century since the eruption, the island has re-formed from lava flows. The table above shows the number of species of various plant types that were found on the island over a 30 year period, since the island re-surfaced above the ocean in the 1950's. Which of these plants is likely to be a pioneer species?

Biology
1 answer:
Nadusha1986 [10]3 years ago
6 0
As you can see in the table presented below, in the first few years after the eruption, there was a significant number of moss species present.
Pioneer species are species that are very resilient and first to inhabit new habitats or repopulate disrupted ones, so in this example, mosses are the most likely candidate for pioneer species.

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When the comb jelly, Mnemiopsis leidyi, was introduced into the Black Sea, its population exploded to 500 comb jellies per cubic
nikitadnepr [17]

The answer is invasive species.


Invasive species are species that are not native to specific ecosystem, but they have a capability to spread widely through the ecosystem, This way they can threaten native species of the ecosystem or cause environmental harm. 

<span>After being introduced into the Black Sea, they greatly affect local ecosystem. In the new area, they have no natural predators and are able to spread. If they spread beyond the area they are introduced, they become invasive species which can overgrow native biotopes and are a great threat to the local biodiversity. This could lead to the extinction of some native species.</span>

7 0
3 years ago
Which of the following statements is the most likely explanation for plant withering due to leaky membranes in cold temperatures
podryga [215]

Answer:

C. H+ ions do not accumulate inside the thylakoid, so ATP synthase makes too little ATP.

Explanation:

Plant withering refers to the virtual death of plant cells due to lack of food. During the light-dependent reactions of photosynthesis, ATP needed for the synthesis of sugar (food) is created in the thylakoid membrane of the CHLOROPLAST of plant cells.

In the light-dependent reaction, hydrogen ions (H+) builds up/accumulate in the thylakoid lumen to create an electrochemical or proton gradient i.e. a difference in the concentration of H+ ions across the membrane. The hydrogen ions passes through a protein complex called ATP synthase, which forms ATP from ADP (by adding phosphate group), from the energy generated by the electrochemical gradient formed as a result of hydrogen in (H+) build up.

Hence, a plant that possess leaky membrane due to the cold temperature will likely wither because H+ ions are not able to accumulate inside the thylakoid causing a proton gradient, so ATP synthase makes too little ATP.

4 0
2 years ago
Which of the following is FALSE? Muscle cells contain myosin II, which is responsible for contraction. Myosin I is the only fami
natima [27]

Answer: Muscles cell contain myosin II, which is responsible for muscle contractions.

Explanation:

Myosin are motor proteins that are responsible for muscle contractions and motility processes in animals.

Myosin II is also called conventional myosin is a form of myosin found in muscles cells and are responsible for muscles contraction in animal cells. It is found in non muscles cells called stress fibers.

3 0
2 years ago
Breastfed infants typically are resistant to disease because of ________.
DochEvi [55]

Answer:

Passice immunity

Explanation:

Breast milk, produced by female mammals (including humans), besides being rich in fat and protein is full of IgA. IgA is the immunoglobulin (immune system signal proteins) that is present in body secretions, such as milk.

The baby that is fed from the mother's breast ingests these defense proteins that allow it to tolerate different pathogens and toxins.  

It is considered passive immunity, as it does not generate memory and depends on a continuous dose to maintain defense levels.

6 0
2 years ago
When four hydrogen atoms bond with oxygen and four electrons what molecule is created?
galina1969 [7]
Hey the answer to this question is Covalent bond.
4 0
2 years ago
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