Answer:
At the beginning, aerobic respiration is used by his legs to generate energy when there was still sufficient oxygen intake for energy to be generated via oxidative phosphorylation.
Towards the end of the ride, his legs are generating energy through anaerobic respiration due to insufficient oxygen intake to keep up with the energy requirement of his muscles as he cycles continuously. Through anaerobic respiration, pyruvate from glycolysis is converted to lactate by lactate dehydrogenase instead of being channelled to the mitochondria for oxidative phosphorylation. The accumulation of lactate in his muscles is what causes the pain in his leg. After he stops the activity, the pain would reduce as lactate is transported to the liver to be reconverted back into pyruvate.
II. low precipitation
III. poorly developed soils
IV. animals with extreme adaptations
V. hot days and cold night
A) II only
B) I and II only
C) II, III, and IV only
D) III, IV, and V only
Answer:
C) II, III, and IV only
II. low precipitation
III. poorly developed soils
IV. animals with extreme adaptations
Explanation:
This is something that generally comes from environmental knowledge.
I. Permafrost. This is commonly found in Tundra's, and is arguably the definition OF a tundra. Tundra's have land with underlying permafrost, which prevents plants that rely on large roots from breaching the land. Deserts don't have THIS problem, they just have sand and overly dried rock-soil.
II. Low precipitation. This is true of both deserts and tundras. If you've ever seen a desert-set- movie, you'd know that the prominent issue of deserts is that they never seem to have water. While Hollywood isn't to be considered accurate, it DOES have some truth here. Deserts are infamous for their extremely low amounts of precipitation (rain). Tundras are nearly identical, though due to other reasons.
III. Poorly developed soils. Yes, Tundras and Deserts both have terrible, terrible soil, for opposite reasons. Tundras are known for extremely low temperatures and little precipitation. Deserts are known for extremely hot temperatures and little precipitation. With Tundras, permafrost lays beneath all the land, preventing any serious plants from growing (outside of resilient grasses, weeds, and shrubs). Deserts have the opposite issue... they average 102 degrees during the day and 24 degrees at night. Excluding the typical presence of sand, this makes for VERY rough soil, as it's baked throughout the day and hardened at night.
IV. Animals with extreme adaptions. Yes. In Tundra's, you'll find a majority of animals that have found ways to adapt to the extremely low temperatures... namely foxes, hares, reindeer, wolves, birds, and some smaller mammals. In deserts, you'll find animals who've adapted to living and thriving in hot temperatures and tolerating the night temps. . .namely reptiles, foxes, scorpions, and armadillos, along with some birds.
V. Hot days and Cold nights. As mentioned before, Deserts average 102F during the day and 24F at night. On the CONTRARY, tundras average -30F to 20F. Obviously, this answer choice is only applicable to deserts.
Hope this helps!
~Troy
Abiotic factors in healthy ecosystems are not in balance.
b.
Abiotic factors are located in the soil of ecosystems only.
c.
Abiotic factors are part of a dynamic system.
d.
Abiotic factors in ecosystems are used up by the living components.
Answer: a vector
Explanation:
A Vector is a physical quantiy that has can magnitude and direction. Examples of vectors are Velocity, acceleration, force, momentum etc
Now, since velocity is defined as the displacement experienced by an object in a specified direction, it is therefore correct to call velocity a vector
Answer:
Carbon-14 has 8 neutrons.
Explanation:
To find the number of neutrons when given the atomic mass and the protons, all you have to do is subtract the number of protons from the atomic mass.
If beavers built a dam on a stream, the kinds of plants and animals that lived around the stream would not be affected; this is a false statement as the dam becomes the barrier in the stream.
The dam is an artificial structure that prevents the flow of water in the river and holds the water for various purposes, such as electricity generation and water distribution to the urban population, among others, so when the dam is formed in the stream, the free path of the fish and other species is restricted as they can't swim freely, and this restricts the biodiversity in the stream.
Hence, if beavers built a dam on a stream, the kinds of plants and animals that lived around the stream would not be affected; this is a false statement as the dam becomes the barrier in the stream.
Learn more about the importance of the dam here.
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