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

O cell membrane

O cytoplasm

O endoplasmic reticulum

O mitochondrion

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. Now imagine that you traveled to an Earth-like planet located light-years away that is known to support life.

What abiotic components would most likely change in a shallow ocean ecosystem during upwelling? Increase in oxygen content Decrease in oxygen content Increase in competition Decrease in competition

Which of the following is not part of a leaf? Chlonoryst Xylem Chlorophyll Stomata

Which of the following is an example of sustainable resource management? O A. Harvesting wild fish faster than they can reproduce O B. Using energy-efficient household appliances O C. Using only nonrenewable materials to build products O D.

What are the causes of genetic variation

Besides A-B-O blood typing, what other characteristics of blood are used for identification?

What is significant about the male reproductive organ as it applies to internal fertilization?

How do fossils lend evidence in support of the Theory of Evolution?

Why are some motors painted black? A) Black is a standard color code for motors. B) This prevents loss of heat from the motor. C) The motor is hotter than the surroundings and emits heat.

How can these forelimbs explain how life changes over time? Homologous structure of four different animals The illustrations show the vestigial structures of four different species that once had a function in an ancestral organism but no longer have