Question 3 The diagram below represents a stack of rock layers. Examine the diagram, and answer the question that
follows.
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4
3
2
1
What do these layers and their fossils suggest about Earth's history?
A. There have been changes in Earth's lifeforms over time.
B.
Only one kind of lifeform lived where these layers formed.
c. Lifeforms on Earth have been the same over time.
D. No lifeforms were present when these layers formed.
Question 4

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

Plz genetic engineering can be applied to many fields including medicine and agriculture. which of the following is a medical application of genetic engineering? a. giving crop plants recombinant dna so that they would be resistant to herbicides. b. examining a persons pedigree to determine whether they can carry a gene for a genetic disease. c. analyzing a persons dna to see how closely they are related to another person. d. certain genes into bacteria so that they will produce a needed medicine.

Explain the significance of the increased cell specialization of the volvocine line