A student records his pulse rate at rest and again after exercising for 30 minutes. He repeats this process for 15 days. There is a trend in his pulse rate and a possible explanation. His explanation is known as Group of answer choices

a theory

a hypothesis

raw data

an observation

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Both male and female gametes are created during the process of meiosis. the formation of male gametes is called spermatogenesis. after telophase il of spermatogenesis, there would be are all genetically male gametes created that

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit