B. Composition mostly hydrogen and helium gas Mass 1.989 × 10³⁰ kg
Explanation:
The best data that describes the sun is that it's composition is made up of mostly hydrogen and helium gas with a mass of about 1.989 x 10³⁰kg.
- The sun is the largest body in our solar system and all planetary bodies revolves round it.
- At the core of the sun, nuclear fusion is occurring.
- Here, small atomic nuclei combines into larger ones with the release of a large amount of energy.
- The small nuclei are hydrogen and they produce helium.
- This process produce energy for the whole solar system.
- The sun is best defined as giant hot ball of gases.
Learn more:
Sun's energy brainly.com/question/1140127
#learnwithBrainly
Condition characterized by loss of peristaltic functioning.
Answer:
Petri plates are incubated upside down to prevent contamination.
Explanation:
The plates are always incubated inverted or turned upside down on their covers during storage. This is done to prevent evaporation if plaque is stored for long periods, which can affect the growth efficiency of bacteria, or allow contamination by multiplying unwanted organisms such as mold.
Once the plaques have been filled with a damp suspension of bacteria, it should be allowed to evaporate shortly before overnight incubation. However, a moderate amount of moisture will still be present. If plaque is not inverted during incubation, bacteria will not be able to attach to the culture medium properly, which will either prevent them from growing and forming colonies properly or will encourage the growth of undesirable microorganisms.
Any of these results will invalidate the experiment. In addition, any condensation or moisture can cause streaking, which will make it difficult to select and analyze separate colonies. After bacteria form colonies, plaque is also stored upside down to maintain moisture levels.
Answer:
c
Explanation:
its correct on e2020 i did the test
Answer:
The answer is a) allopatric speciation.
Explanation:
Allopatric speciation happens when a geographical or physical barrier is introduced in a population. After this, the reproductive isolation, genetic recombination and also random mutations can promote the speciation process, where at the end, there will be two separate species.
