Which ecosystem is least able to sustain its organisms during a period of environmental stress A Desert
B Grassland
C Rainforest
D Artic

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction