The basic unit of all forms of life is a(n)a. organ system.
b. organ.
c. tissue.
d. cell. User: Which of the following is an example of epithelial tissue?
a. bone
b. skin
c. fat
d. muscle User: The excretory system consists of which of the following organs?
a. stomach, liver, pancreas
b. lungs, nose, trachea
c. kidneys, ureters, urinary bladder
d. brain, spinal cord, sense organs

Which of the following statements about biogeochemical cycles is not true?a. Biogeochemical cycles include living and nonliving elements.
b. The rock cycle is a biogeochemical cycle.
c. Biogeochemical cycles are an important part of the Earth system.
d. Carbon, nitrogen, and oxygen cycles are biogeochemical cycles.

Which of the following organ systems controls the neuron synapses in the fight or flight response?Animals and humans respond to threats in various ways. This is the fight or flight response. Some animals will run while others freeze, fight, camouflage or play dead. When the brain receives messages from the sympathetic and parasympathetic systems through neurons, the body responds by increasing blood pressure, heart rate and blood flow to the muscular system. These responses increase muscle tension to provide the body with extra speed and strength as well as thicken the blood to prevent blood loss should injuries incur during the threatening encounter.

Click on the correct answer(s)

A
Circulatory System
B
Skeletal System
C
Nervous System
D
Muscular System

Although hummingbirds and house flies both use wings to fly, this similarity is not based upon closely shared ancestry but rather on evolution and adaptation as a result of survival and reproduction in a given environment. The term best describing such a phenomenon is

The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell.For example, consider these two proteins:1. Phosphofructokinase (PFK) is an enzyme that functions in the cytoplasm duringglycolysis.2. Insulin, a protein that regulates blood sugar levels, is secreted from specializedpancreatic cells.Assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations.For each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (Note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)Options:Cytoplasm only, ER --> cytoplasm, ER --> Golgi --> outside cell, cytoplasm --> ER --> outside cell, Golgi --> ER --> outside cell, cytoplasm --> Golgi --> outside cell, nucleus --> cytoplasm, ER --> Golgi --> cytoplasm

Select all that apply.How are protists different from bacteria and archaea?

1. They are at least ten times larger.
2. They can reproduce asexually.
3. They are eukaryotes.
4. They consist of both single- and multi-celled organisms.
5. They have flagella to move

A scientist wants to prove that certain chemicals in cosmetics are likely to cause harm to developing fetuses, when used by a pregnant mother. What is the most likely limitation she will face in her scientific design?limitations due to the time required to complete the experiment

limitations due to the system being too large to investigate thoroughly

limitations due to high expenses for equipment and supplies

limitations due to ethical concerns about experimental subjects