Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?

A: cell membrane

B: cytoplasm

C: endoplasmic reticulum

D: mitochondrion

Which statement best describes how science influences the development of a national law? O O O O Scientists find an innovative way to filter tap water. Scientists answer public concerns about the dead fish in a lake.

Which example illustrates Darwin's main contribution to the theory of evolution? An agricultural pest has been exposed to a pesticide that wipes out the entire species.

During which phase are sister chromatids separated? prophase metaphase anaphase telophase

Who experimented with rats to demonstrate that organisms can learn even if they do not receive immediate reinforcement?

Which one identifies active uptake of sodium idions and why

What is a likely consequence of continued human population growth?

Why is an organisms role important for its community?

Briefly describe what is meant by the semiconservative nature ofDNA replication?

Why do sex-linked traits follow different patterns of inheritance than other traits? Apex

Some animals, like birds, reproduce by fusion of cells. Before a bird hatches, what protects the bird as it develops?