Rheumatoid arthritis is caused by:

a bacteria

a virus

a reaction to an immunization

an autoimmune reaction

What instrument is used to measure barometric pressure? A. ceilometer B. barometer C. anemometer D. thermometer

Jane and Jill wondered if the water plants required was related to the temperature of the air around the plants. The girls planted three pots of grass seed. Once the seeds germinated, they placed one pot in the sun, outdoors.

Whats was the one single continent names before it spiltsup to 7 different continents?

What is the the definition of a gene?

Which example which a cell membrane receving and sending messages

Virtual lab which cancer shows the most aggressive growth

What is the main role if the hormones

How do predator & prey populations interact with each other? (In terms of population size.)

What is the source of the infection Cyclospora? How did the biological characteristics of the pathogen influence you conclusion?

Why do cells in meiosis need to be different from those produced during mitosis?