A population has certain attributes that an individual organism does not. These are
a. Birth rate
b. Death rate
c. Sex ratio
d. Age distribution

Options

A. a and b
B. b and c
C. c and d
D. a, b, c and d

Explanation

To solve the question regarding the attributes of a population that an individual organism does not possess, we can analyze each option provided:

1. **Birth Rate (Natality)**: This refers to the number of live births in a population over a specific period. It is a characteristic of populations and not of individual organisms. An individual organism does not have a birth rate; it can only give birth.

2. **Death Rate (Mortality)**: This is the number of deaths in a population over a specific period. Similar to birth rate, death rate is a population attribute. An individual organism experiences death, but it does not have a death rate as a statistical measure.

3. **Sex Ratio**: This is the ratio of males to females in a population. It is a demographic characteristic that describes the composition of a population. An individual organism does not have a sex ratio; it is either male or female.

4. **Age Distribution**: This refers to the proportion of individuals of different ages within a population. It is a characteristic that describes the age structure of a population. An individual organism has a specific age but does not have age distribution as it pertains to a group.

Since all the options (a, b, c, and d) are attributes that apply to populations and not to individual organisms, the correct answer is:

**Answer: a, b, c, and d (all of the above)**