What cell controls the movement of material between the inside of the cell and the outside world?

1. Nucleus

2. Vacouoles

3. Cytoplasm

4. Cell membrane

Black bears eat both plants and small animals in their ecosystem. Which of the following terms best describes a black bear? A. Producer OB. Herbivore O C. Omnivore D. Carnivore

Compound weighing 115 g contains 68.3 g of carbon, 13.2 g of hydrogen, 15.9 g of nitrogen, and some amount of oxygen. What is the mass percent of oxygen in the compound?

Whales in the order Mysteceti are larger than whales in order Odontoceti. Which of the following best explains this? whales in order Mysteceti are filter feeders and obtain higher levels of energy by consuming krill, zooplankton, and small fish.

If a planet has twice the mass of Earth, its radius would have to be larger by a factor of 2 for the gravitational field strength at the planet's surface to be the same as on Earth's surface. T or F

All the biotic and abiotic factors in a particular area A: ecosystem B: biome C: habitat

Which of these activities is not considered to be a marine ecosystem threat? overfishing. ocean pollution. coastal development. ocean alkalinity?

What is another common intramuscular injection site for 2mL or less of a drug? a Ventrogluteal b. Vastus Lateralis c Deltoid d Infraspinatus

Which element acts as a hydrogen acceptor during aerobic respiration? (A) hydrogen (B) carbon (C) oxygen (D) nitrogen (E) phosphorus Can someone explain this one for me?

How do bacteria and viruses differ in the ways they affect cells in the body?

What does high water potential mean?