Answer: The correct answer is-
Allopatric- option 2.
Sympatric - option 1.
Allopatric and sympatric are primarily the two major mechanisms for speciation ( formation of new species from an ancestral species).
In allopatric speciation, a population splits into two different species when it is isolated by physical or geographical barrier.
On the other hand, sympatric speciation occurs wihtin the same area. A population splits into two species that is becomes reproductively isolated when a change in the chromosome number occurs.
Thus, option first corresponds to sympatric whereas option second shows allopatric speciaton.
A Safety Data Sheet refers to a detailed information document prepared by a manufacturer of hazardous chemicals. It describes the physical and chemical properties of the product.
<h3>What is
Safety Data Sheet?</h3>
- A Safety Data Sheet refers to a detailed information document prepared by a manufacturer or importer of hazardous chemicals.
- Describes the physical and chemical properties of the product.
- A safety data sheet provides comprehensive information about a chemical, including its properties physical, health, and environmental hazards; and protective measures or safety precautions to be followed in handling, storing, or transporting materials.
- Safety data sheets inform users about product hazards, how to use the product safely, what to expect if recommendations are not followed, how to recognize symptoms of exposure, and what to do in an emergency .
- Safety data sheets provide information about chemicals and help users of those chemicals to make risk assessments.
- They describe hazards arising from chemicals and provide information on handling, storage, and emergency procedures in the event of an accident.
To learn more about Safety Data Sheet from the given link :
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Answer:
Structure in a chromosome that holds together the two chromatids
Explanation:
awnser is high concentrations of oxygen
<span>Characteristics that mentioned biomes have in common are:
- They are all forests, dominated by trees and other woody vegetation.
- They inhabit animal life with great microbial diversity.
- They all have big carbon sinks.
Still, trees different in a number of ways in these three biomes:
- </span><span>Tropical rainforest: Trees are evergreen and have large green leaves. Canopy is multilayered and dense, so there is a little light in the forests.
- </span><span>Temperate deciduous forest: Trees are deciduous, leaves are lost annually. Canopy is moderately dense, so there is more light than in tropical rainforests.
- </span><span>Boreal forest: Trees are evergreen conifers with needle-like leaves. Canopy is thick and permits low light penetration.</span>
