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Anastasy [175]
3 years ago
9

"by measuring the relative abundances of two stable isotopes of oxygen - 16o and 18o - in some fossil deposit, or in an ice core

, or in a coal bed, or in some sedimentary layer, what can one determine about the conditions that pertained at the time those deposits were laid down
Biology
1 answer:
maks197457 [2]3 years ago
5 0
Stable isotopes refers to those isotopes that do not undergo radioactive decay. Oxygen atoms with atomic number of 16 and 18 are examples of stable isotopes. These isotopes of oxygen are usually found in substances such as polar ice and calcite. These substances are usaually measure with isotope fractionation and the ratios obtained are used to estimate water temperature of ancient oceans. From this, scientists can find out facts about ancient climates, 
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The population change equation is Population Change = (Natality - Mortality) + (Immigration - Emigration). Which equation would
Snezhnost [94]

Answer:

B. natality + immigration = mortality + emigration

Explanation:

Migration refers to the movement of a group of people from one geographical region (location) to another geographical destination in search of better living conditions, work or social amenities.

Migration selectivity can be defined as the likelihood or tendency that a subset (part) of a group of people are going to move (migrate) out of a particular geographical location or area.

Some of the factors that influence migration selectivity are income level, age, education, gender etc.

Population change equation states that the change in the size of a population over a specific period of time is equal to the sum of the number of births and the number of immigrants that joined.

Mathematically, the population change equation is given by the formula;

Population Change = (Natality - Mortality) + (Immigration - Emigration)

Therefore, the equation which would create a stable population is given by the formula;

Natality + immigration = mortality + emigration.

8 0
2 years ago
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