Select all answers that apply. for radiometric dating, you need to know which of the following?
the rate at which radioactive decay occurs
collection of fossil shells from sedimentary rocks
how much radioactive decay has occurred
the sequence of rock layers

Option (1) and (3)

Explanation: Radiometric dating is a very efficient method of dating a rock or fossil or any object. It helps in determining the estimated age of that particular object.

The half-life of all the radioactive methods are already known, so it becomes easy to determine how much decay an object has undergone. So by knowing the rate at which the decay occurs, one can find out the approximate age by using the radioactive decay formula.

Thus, the correct answer is option (1) and (3).

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.