4.10: Mammals
- Page ID
- 6910
\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)
\( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)
\( \newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\)
( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\)
\( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\)
\( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\)
\( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\)
\( \newcommand{\Span}{\mathrm{span}}\)
\( \newcommand{\id}{\mathrm{id}}\)
\( \newcommand{\Span}{\mathrm{span}}\)
\( \newcommand{\kernel}{\mathrm{null}\,}\)
\( \newcommand{\range}{\mathrm{range}\,}\)
\( \newcommand{\RealPart}{\mathrm{Re}}\)
\( \newcommand{\ImaginaryPart}{\mathrm{Im}}\)
\( \newcommand{\Argument}{\mathrm{Arg}}\)
\( \newcommand{\norm}[1]{\| #1 \|}\)
\( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\)
\( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\AA}{\unicode[.8,0]{x212B}}\)
\( \newcommand{\vectorA}[1]{\vec{#1}} % arrow\)
\( \newcommand{\vectorAt}[1]{\vec{\text{#1}}} % arrow\)
\( \newcommand{\vectorB}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)
\( \newcommand{\vectorC}[1]{\textbf{#1}} \)
\( \newcommand{\vectorD}[1]{\overrightarrow{#1}} \)
\( \newcommand{\vectorDt}[1]{\overrightarrow{\text{#1}}} \)
\( \newcommand{\vectE}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{\mathbf {#1}}}} \)
\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)
\( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)
Protomammals
Examples of living mammals
Monotremes
Marsupials
Placental Mammals
Imagination Questions
Power of ten | Generations | Average age of menarche (First menstruation) | Average reproductive lifespan or age of menopause | Average generation length (years) | Years ago | Who was my Great, Great […] Grandma? | Arnie's example: |
---|---|---|---|---|---|---|---|
1 | 1 | 13 | 50 | 25 | 25 | Mom | |
2 | 10 | 17 | 40 | 20 | 200 | great, great, great, great, great, great, great, great, great, great, grandmother, probably an Irish peasant | |
3 | 100 | ? | 25 | 18 | 1800 | great, [x100], great grandmother, possibly a Celtic peasant | |
4 | 1,000 | ? | ? | 17 | 17,000 | ||
5 | 10,000 | ? | ? | 16 | 160,000 | ||
6 | 100,000 | ? | ? | 15 | 1,500,000 | ||
7 | 1,000,000 | 9 | ? | 12 | 12,000,000 | ||
8 | 10,000,000 | N/A | 6 | 60,000,000 | |||
9 | 100,000,000 | N/A | 4 | 400,000,000 | |||
10 | 1,000,000,000 | N/A | 0.7 | 700,000,000 | |||
11 | 10,000,000,000 | N/A | 0.1 | 1,000,000,000 | |||
12 | 100,000,000,000 | N/A | 0.017 | 1,700,000,000 | |||
13 | 1,000,000,000,000 | N/A | 0.002 | 2,000,000,000 | great, […],great grandmother, an algae-like eukaryote | ||
14 | 10, 000,000,000,000 | N/A | 0.00036 | 3,600,000,000 | great, […],great grandmother, a cyanobacterium in a stromatolite | ||
15 | 100,000,000,000,000 | N/A | 0.000044 | 4,400,000,000 | great, […],great grandmother, a strand of self- replicating molecule swirling in primordial ooze | ||
16 | etc. | 13,800,000,000 | stardust |