In which supereon did single-celled organisms first form on Earth?

a. Cambrian

b. Paleozoic

c. Phanerozoic

d. Precambrian

Using the lock and key theory explain how the enzyme amylase is specific for breaking down starch

A slow reproduction process is a disadvantage of which form of reproduction?

A scientist has chosen to study the motion of clouds in the atmosphere during a thunderstorm. Which type of model is most appropriate for her investigation

Describe how the sun affects the presence of water in different biomes around the world

1. The number of flowers on different breeds of bushes in a greenhouse is recorded every week for two months. a. Scientific Question: what is the scientific question for this sentence?

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?

What is the pattern of expression for autosomal genes?