Vertebrates and invertebrates differ in the presence of a backbone. another characteristic that distinguishes most vertebrates from many invertebrates, is that vertebrates —

question 9 options:

have a relatively well-developed brain and circulatory system.

have long tube-like bodies that are divided into segments.

take in oxygen from their skins rather than from an inside organ.

have hard outer covering called exoskeletons.

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

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