When do spring tides occur?

A. during a new moon

B. during a first quarter moon

C. during a waxing gibbous moon

D. during a waning crescent moon

Which phrase best defines the term homologous structures?

What evolutionary changes were essential to the development of complex body plans? A. mobility B. internal fertilization C. tissue and cell differentiation D. body symmetry

Select the correct answer from each drop-down menu. Mateo goes to his doctor after experiencing discomfort for a few days.

Which of these is a challenge related to nuclear fusion reactions?

Organisms within a population must complete for resources to survive?

Which of the following scenarios describes an epistatic gene interaction?

An 1815 volcanic eruption in Indonesia was followed by a three-year famine around the world. How was the volcano linked to the famine? O A. The eruption's ash and gas significantly dimmed the sun. B.

In the general equation of photosynthesis, why is chlorophyll written over the arrow rather than on the left side of the equation'

How many years did the Precambrian Era span? 2.5 billion 5 million 5,000 none of the above

Explain why most quartz is useful?