Why do you think some bones, such as the humerus and femur, have rounded ends? why do you think other bones, such as the vertebrae and carpals, have flat sides.

1. Their rounded shape allow them to joint properly with other bones, permitting a softer, better motion.

2. Provide protection for specific organs and their shape provides a broad surface for the proper attachment of muscles.

Explanation:

The bone is a connective tissue composed of specialized cells, a mineral-salt matrix, and collagen fibers. The main functions of the bones are organ protection, structure, red and white blood cell production and support.

There are different types of bones:

Some bones, such as the humerus and femur, are characterized by their rounded ends, also known as epiphyses (epiphysis - singular). The reason behind epiphyses is joint function. These bones are long bones, and their rounded shape allow them to ajoint properly with other bones, permitting a softer, better motion.

On the other hand, flat bones, such as vertebrae and carpals, provide protection for specific organs and their shape provides a broad surface for the proper attachment of muscles.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.