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The key to life history theory is that there are limited resources available, and focusing on only a few life history characteristics is necessary. Examples of some major life history characteristics include: Age at first reproductive event; Reproductive lifespan and ageing; Number and size of offspring
Organisms whose life history is subject to r-selection are often referred to as r-strategists or r-selected. Organisms that exhibit r -selected traits can range from bacteria and diatoms , to insects and grasses , to various semelparous cephalopods , certain families of birds, such as dabbling ducks , and small mammals , particularly rodents .
The sequences of succession are thus entirely dependent on life-history characteristics such as the specific amount of energy a species allocates to growth. [ 3 ] The climax community is composed of the most "tolerant" species that can co-exist with other species in a more densely populated area.
Life history may refer to: Life history theory, a theory of biological evolution that seeks to explain aspects of organisms' anatomy and behavior by reference to the way that their life histories have been shaped by natural selection; Life history (sociology), the overall picture of an informant's or interviewee's life
The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth.Dates in this article are consensus estimates based on scientific evidence, mainly fossils.
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
The term life history is often used, particularly for organisms such as the red algae which have three multicellular stages (or more), rather than two. [ 3 ] Life cycles that include sexual reproduction involve alternating haploid ( n ) and diploid (2 n ) stages, i.e., a change of ploidy is involved.
The universal tetrapod characteristics of front limbs that bend backward at the elbow and hind limbs that bend forward at the knee can plausibly be traced to early tetrapods living in shallow water. [18] Panderichthys is a 90–130 cm (35–50 in) long fish from the Late Devonian period (380 Mya). It has a large tetrapod-like head.