How does the carbon dioxide necessary for photosynthesis enter plants? a. through their roots b. through openings in the leaves called stomata c. the plants produce their own complete supply d. none of the above

Many organisms depend on the land as a food source. Seasons can affect the amount of food that is available to these organisms. How would a long, cold winter most likely affect a population of deer? A) The deer population will decrease.

Summarize the steps of sexual reproduction and explain how in increases genetic diversity

In terms of energy, what kind of system is a sealed glass, terrarium on a windowsill?

Multicellular plants and animals having an organ of perform specific functions. What do Eukaryotic sales have to perform a Specific functions

1. Which one of these is not an example of intracellular communication? A nerve cell stimulates a muscle cell to contract. A signal is translated to cause muscle contraction. A muscle cell action is coordinated. A muscle cell maintains homeostasis.

The failure of homologous chromosomes to separate during meiosis is called a. skin disorders b. translocation. c. nondisjunction. d. Down syndrome.

As the wavelength increases, the frequency (A) decreases and energy decreases. (B) increases and energy increases. (C) decreases and energy increases. (D) increases and energy decreases.

The most obvious source of gene flow into any population is A) Emigration B) Immigration

Polypeptides and proteins must fold properly to be functional. Hydrogen bonds between the oxygen and nitrogen atoms of the peptide bonds are crucial to which level of protein structure?1. primary structure2. tertiary structure3. secondary structure4.

A particular gene can have two forms, called alleles. which statement best describes the difference between the dominant allele and the recessive allele? (a) only the recessive allele is expressed when both alleles ate inherited.