Explain why Francesco Redi’s experiment with flies did not completely disprove spontaneous generation.

Who was the scientist who showed that microscopic life is not produced by spontaneous generation? A. Francesco Redi. B. Stanley Miller. C. Louis Pasteur. D. Harold Urey.

Why is knowledge of geology important to paleontologists?

Explain how fossils might help paleontologists to learn about the important behaviors of different types of animals. Which social behaviors might they provide information about?

How might the way organisms obtain energy have evolved over time?

What structures do all cells have?

What are the evolutionary advantages of seeds?

Select the correct answer for the following question:
Which of the following membrane movements is not by a passive process?
a. osmosis
b. diffusion
c. active transport
d. filtration

Scientists theorize that oxygen buildup in the atmosphere resulted from ____. A. respiration. B. photosynthesis. C. chemosynthesis. D. rock weathering.

Why do scientists propose that the 3.4 billion-year-old fossils of cyanobacteria-like prokaryotic cells found in Australia were not the first species to have evolved on Earth?

Which of these is an example of active transport?

An entire, intact organism may be preserved in ____ and ____. A. casts-trace fossils. B. molds—casts. C. trace fossils—petrified fossils. D. amber—ice.

About how many years ago do scientists suggest that Earth cooled enough for water vapor to condense? A. 20 million years. B. 4.6 billion years. C. 4.4 billion years. D. 5.5 billion years.

Horses and zebras can be bred to produce a zorse, which is infertile. Which is most likely the reason zebras and horses are considered separate species?

A. They cannot breed.

B. Their offspring cannot breed.

C. They look different from each other.

D. They are found in different habitats.