If a scientist finds the remains of a plant between a rock layer that

contains 400 million-year-old Phacops fossils and a rock layer that contains

230 million-year-old Tropites fossils, how old could the plant fossil be?

If placed in a hypotonic solution, an animal cell will?

Which of the following has a knot of nerve tissue at its head end? a. octopus. b. sponges. c. worms. d. bacteria.

Who is louis pasteur?

If a cell in metaphase of mitosis is fused with a cell in the G$$_1$$ phase of the cell cycle, the second nucleus will also begin mitosis. What is the most likely explanation for this behavior? A.

How do species change to their environment

What factors affect the diffusion of water through a membrane by osmosis?

What chemical structure makes up the cell membrane? protein bilayer hydrophilic phosphate phospholipid bilayer hydrophobic fatty acid

Which of the following statements accurately describes the process of dating Earth's history?

Which event occurs first during viral infection? the viral genome and proteins enter the host cell. the virus fuses its envelope to the host cell membrane. the viral genome is transcribed. viral proteins and mrna molecules are assembled?

Summarize the four concepts collectively known as the "cell theory"