The question is incomplete. The complete question is:
Question: Why do organisms without oxygen need to convert pyruvate to lactate?
A) because pyruvate is toxic to the cells
B) in order to regenerate NAD+
C) in order to use lactate in the citric acid cycle
D) because lactate is needed to produce ATP
Answer:
B) in order to regenerate NAD+
Explanation:
Kreb's cycle and electron transport chain (ETC) are the aerobic stages of cellular respiration. ETC regenerates NAD+ and FAD+ by oxidation of NADH and FADH2 produced during glycolysis and Kreb's cycle. Here, oxygen serves as the terminal electron acceptor.
Glycolytic reactions use NAD+ as an electron acceptor and produce NADH. Therefore, a constant supply of NAD+ is required to sustain glycolysis. In absence of oxygen, ETC cannot occur and organisms convert pyruvate into lactate. Pyruvate is reduced in lactate and NADH serves as the electron donor. Thereby, lactate fermentation regenerates NAD+ to continue the process of glycolysis.
<h2>Species richness </h2>
Explanation:
Resource partitioning is a type of strategy of coexistence among species which allow species to use natural resources in different ways and it may be temporal or spatial
There are two attributes of a community which will tend to lead to lower species richness in a community:
1) Most species are generalists, utilizing a broad spectrum of resources
: Species that can live in many different types of environments, and have a varied diet are considered generalists
2) Most species are specialists, utilizing a narrow spectrum of resources: Specialists are those species that require very unique resources, these type of species have a very limited diet or need a specific habitat condition to survive
The answer would be "a person's skin"
hope this helps :)
Silt would be your answer here
