Astudent claimed that a solution with a concentration of na+ of 5.0 ppm will have a lower measured absorbance than a solution with a 1.0 ppm concentration of na+. based on the results of experiment 1, explain why the student’s claim was incorrect. as part of your explanation, give your prediction for an approximate measured absorbance for a solution with a 5.0 ppm concentration of na+.

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

Control of the body is accomplished by which of the following body systems? nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems