Which of the following can last for a lifetime? natural immunization
antibiotic immunization
immunoglobulin
artificial immunization

Here's one way to follow the scientific method. place the missing steps in the correct position in the process.

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

The basic types of tissue in the human body are