What is the difference betweent animal and plant cells? ?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Defend or refute the argument that the government has too large a presence in the agriculture industry.

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.