Lactic acid fermentation occurs as an alternative to that of aerobic respiration, this occurs in cases where oxygen levels or concentrations within the cells are very low and as a result, is not available for the acceptance of electrons as the final electron acceptor. The cells undergo this process, where essentially, rather mr than using oxygen as the final electron acceptor after producing ATP. NAD+ I believe is able to accept electrons and thus we can produce ATP, again. Glycolysis occurs but rather than moving on to the next stage, Pyruvate molecules are ultimately converted to lactic acid which releases ATP, the extra electrons would go to NAD+ which is needed to keep the reactions going.
What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
Answer:
A. Lancelet
B. All chordates
Explanation:
A. Dorsal nerve chord is the only <u>unique feature</u> among all members of <u>phylum chordata</u> (mainly found in subphylum Vertebrata). In the given list, only lacelet is the Chordate whereas <u>snail belongs to phylum Mollusca</u>, <u>grasshopper belongs to Arthropda</u>, and <u>jellyfish belongs to Cnidaria</u>. Dorsal nerve cord runs along the length of organism's body.
B. <u>Gill slits</u> are <u>opening structures</u> to gills through which water passes from pharynx/throat to exterior. Their main purpose is to help filter the food particles available in surrounding water. Although they are typical for amphibians and fishes, chordates also possess gill slits at embryonic stages.
Answer:
I CAN UNDERSTAND SOME WORDS OF YUR QUESTION.
Explanation:
BUT MOST I HAVE NO CLUE.
I AM SO SORRY, BUT I CAN NOT UNDERSTAND SPANISH, YOU PROB CAN NOT UNDERSTAND ENGLISH EITHER, BUT IF U CAN, CAN U PUT QUESTION IN ENGLISH?
Allopatric Speciation
describes why similar organisms do not interbreed because of a physical barrier.
Explanation:
The specific situation in which the population of identical species doesn’t interbreed or leaves in isolation with each other is referred as ‘allopatric speciation’. It is also considered a specification of geographical factors.
The factors that work as a barrier to the process of breeding between same groups of organisms are- mountain formation, formation of water bodies, agriculture etc. These natural and human occurrences affect the geography of a place that influences the separation in species.
