When do the secondary sex characteristics appear?

Which of the following are true regarding the development of balance during childhood? Select all that apply.

Active older adults add less fat weight than their sedentary peers with aging.

The conduction speed of nerve impulses is aided by the development of ____________ cells that wrap themselves around the axons.

Infants demonstrate some level of visual-auditory integration early in the first year of life.

Because the brain attains 80% of its adult size in the first few postnatal years, it is particularly susceptible to extrinsic factors such as poor nutrition or a physical blow during this time.

Extrinsic (external) factors are those influences that have only a negative effect on growth and development.

The contemporary view is that the perceptual, cognitive, and action developmental systems are independent of one another.

Which of the following is characteristic of proficient catching? Select all that apply.

Recent research has shown that children can be at the most advanced levels of upper arm and forearm action before they routinely use trunk rotation.