A prospective cohort study was conducted to determine the risk of heart attack among men with varying levels of baldness. Third year residents in dermatology conducted visual baldness assessments at the start of the study (which was before any heart attacks had occurred). Four levels of baldness were coded: none, minimal, moderate, and severe. The follow-up rate was close to 100%. Which of the following types of bias were surely avoided in this study? a. Recall bias of the exposure information.
b. Differential misclassification of the exposure.
c. Non-differential misclassification of the exposure.
d. Selection bias due to follow up.

Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

Which are evidence of seafloor spreading? check all that apply. molten material magnetic stripes continent material drilled core samples ocean water samples