Phytoplankton production in the North Atlantic peaks in the spring and mostly comes to a halt in the winter. In the North Pacific, plankton production occurs throughout the winter months. This difference in productivity between the North Atlantic and Pacfic is due to: Group of answer choices

sunlight availability

salinity of the mixed layer

different species of plankton

thermocline

What kinds of molecules can pass through the cell membrane without any problem?

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.

The punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. in this cross, tallness (h) is dominant to shortness (h). based on the punnett square, what is the phenotype of the offspring? hh hh tall short