What feature of the fossil Pikaia led scientists to classify it as a chordate?

A. Tentacles

B. A definite head region

C. A notochord

D. Segmentation

At approximately what age should a child be able to use each hand independently?

Tsunamis pose the greatest threat to populations living

Over the past half century, there has been a trend in the United States and other developed countries for people to marry and start families later in life than did their parents and grandparents.

Gametes from two plant species combine and produce a haploid zygote, and that zygote develops into a haploid, hybrid plant. why is the hybrid plant sterile

The passing of biological information from generation to generation is called

Identify each statement as a hypothesis, theory, or law. Higher air pressure causes fuel to burn at a faster rate.

Which sequence represents the correct levels of organization for multicellular organisms

Which statement best compares and contrasts lipids and carbohydrates? Both are used for tissues, but only carbohydrates are used for tissue growth. Both are used for energy storage, but only carbohydrates are used for long-term energy storage.

What is another name for lane d in the diagram

This is the energy stored as adipose tissue:.