What are two organ systems that are involved in the excretion of wastes from the body?

What causes variation to be passed onto offspring

The RNA strand is produced within the cytoplasm.

What adaptations have plants and animals developed that allow them to survive the extreme climate of the tundra? A) thick fur B) dense hair C) retention of dead leaves D) feathered feet E) all of the above

Excess hydrogen ion is eliminated from the body largely by

How does a cell of a unicellular organism differ from a cell of a multicellular organism? A) It performs all functions. B) It is specialized. C) It is large. D) It never Replicates.

Which molecules is not part of the cell membrane? a. lipid b. nucleic acid c. phosphate group d. steriod e. protein?

During dna replication in a human cell, 6 billions bases must be paired properly. which characteristic of dna best allows for high level of accuracy during this process

Which of the following actual (i. e., real) products of biological activity is not likely to be a source of the increases in greenhouse gases observed in recent history? A.

A population with 65 A1A1 individuals, 55 A1A2 individuals, and 10 A2A2 individuals is in Hardy-Weinberg Equilibrium. Hint: For this problem assume if the expected value is within 3 of the observed it's in HWE.

What is the expected effect of hyperventilation on heart rate? why does this change occur?