Question

Which one or more of the following processes contribute(s) substantially to increased mean global temperatures?

• A. Decreased greenhouse gases in the atmosphere
• B. Increased tropical deforestation
• C. Decreased methane emissions
• D. Increased fossil fuel use

Hint:

Mnemonic: \textbf{r} = \textbf{r}apid—early, many, small, short-lived. \textbf{K} = \textbf{K}are—late, few, large, long-lived.

Answer 1

The Correct Option is B, D

Step 1: Recall \textit{r- vs. \textit{K}-selection.}
\textit{r-selected} species: high intrinsic growth rate \(r\); early maturity, short lifespan, small body size, many small offspring, minimal parental care, thrive in variable/disturbed habitats.
\textit{K-selected} species: late maturity, long lifespan, few large offspring, substantial parental care, stable environments.

Step 2: Match options.

(A) Long lifespan \(\Rightarrow\) \textit{K}-selected, so false.
(B) Large number of offspring per event \(\Rightarrow\) \textit{r-selected}, so true.
(C) Few large-bodied offspring \(\Rightarrow\) \textit{K}-selected, so false.
(D) Reproduce at a young age \(\Rightarrow\) \textit{r-selected}, so true. Final Answer:
\[ \boxed{\text{(B) and (D)}} \]