The graph below shows the radioactive decay of an isotope of uranium. Bar graph showing time in millions of years on x axis and number of uranium atoms present on y axis. Height of bar corresponding to time 0 million years is 100; time 4500 million years is 50; time 9000 million years is 25; time 13,500 million years is 12.5; and time 18,000 million years is 6.25.

Based on the graph, what is the half-life of uranium?

50 years
100 years
4,500 years
9,000 years

Which of the following is a question of morality? a.) delierately reporting false data b.) accidentally reporting false data c.) kepping a sloppy record of experimental observation d.) condition a drug experiment which will harm a lab rats

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed