Which of the following is used to avoid bias in a clinical trial?

A. High self-confidence

B. Financial investment

C. Personal preference

D. Random assignment

Which of the following colors would indicate the coolest star Red Blue Orange Yellow

What are embryonic stem cells more useful than other stem cells?

Is selection more effective against recessive alleles in haploid or diploid organisms?

Why is it important for a cell to be able to turn a gene off?

What causes variation to be passed onto offspring

Which main plant tissue is shown in green?

What substances move freely through the shell of the egg?

Fossil records suggest major changes in early vascular plants that favored the evolution of land plants. Which was one of these major changes? Select one of the options below as your answer: A. Development of fruit B. Development of seed C.

What deep sea mining is

Three general patterns of population dispersion are