True or false the period of an element is the amount of time It takes for half of a radioactive isotope to decay

Michele believes she cannot lose weight because she has a slow metabolism. Of the research she has done on the subject, which would be considered reliable? A. People with slow metabolisms have lower basal metabolic rates B.

The diploid chromosome number is always

Answer choices are independent reliable valid for the first one and for the second is dependent Reliable and valid

Name three processes in the water cycle and state whether each process removes water

Nicotine is a drug found in cigarettes that causes blood vessels to constrict. why would a person with a family history of hypertension want to avoid smoking? nicotine increases blood pressure to unsafe levels.

Stretching of the cervix causes an increase in the blood levels of

True or false: In a gel electrophoresis gel, a DNA fragment containing 100 bp (base pairs) would travel faster (and further) than a strand of DNA containing 1000 bp.

The four steps of the scientific method in order are hypothesis, observation, experimentation, and conclusion. True or false

During an action potential, the "gates" covering the axon's ion channels pop open to allow which ions to rush into the axon?

Looking at a standing human, what is the line that demonstrates the body's bilateral symmetry? a. facing the side and drawing a line up and down the center of the body b. facing the front and drawing a line up and down the center of the body c.