Velma is developing a computer model of translation. Her instructor points out that the model does not include ribosomes or ribosomal rna. If the model is accurate in other ways, how does the absence of ribosomes and ribosomal rna affect it?.

The different forms of a gene for a given trait are called .

In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.

If the null hypothesis is false and the researchers do not reject it a type 2 error has been made. true or false