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The platypus has an average body temperature of about 32 °C (90 °F), lower than the 37 °C (99 °F) typical of placental mammals. [33] Research suggests this has been a gradual adaptation to harsh environmental conditions among the few marginal surviving monotreme species, rather than a general characteristic of past monotremes.
World population pyramid from 1950 to projected in 2100 (UN, World Population Prospects 2017) A population pyramid (age structure diagram) or "age-sex pyramid" is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing. [1]
An example of using age class structure to learn about a population is a regular bell curve for the population of 1-5 year-old fish with a very low population for the 3-year-olds. An age class structure with gaps in population size like the one described earlier implies a bad spawning year 3 years ago in that species. [ 7 ]
California has 2.3 million African Americans as of 2010, the largest population of black or African Americans of the Western US states, [66] and the 5th largest black population in the United States. African Americans are concentrated in Greater Los Angeles, the East Bay of the San Francisco Bay Area, and Sacramento region.
Its population is trending downwards due to loss of habitat from climate change and land clearing. Like many other species, platypuses need healthy freshwater systems to thrive. Watch the Video
Researchers saw the white platypus 10 times between February 2021 and July 2023, the study said.
Their population is estimated as between 10 16 –10 17 (10-100 quadrillion). [29] With an estimated 20 quadrillion ants their biomass comes to 12 megatons of dry carbon, which is more than all wild birds and non-human mammals combined.
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