2.3: Mammals
- Page ID
- 129985
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)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 |