Is a crab a vertebrate or invertebrate?

Answers

Answer 1

Answer: Invertebrate, b/c it doesn't have a spine of any kind

Answer 2

Answer:

Answer:

Every crab is an invertebrate creature that belongs to the crustacean family. There are over 4500 species of crabs and most of them live in the coastal areas of salty, fresh or brackish water (mix of fresh and salty water).

Explanation:

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Body composition has little to do with cardiorespiratory fitness. True or Faulse.

Answers

The answer is false. A number of additional factors effect cardiorespiratory fitness, but body composition is a big one. If you are inactive and 100 or more pounds overweight, your cardiorespiratory fitness will suffer greatly, especially compared to an active person with the proper body weight to their height and age.

the answer is false......................

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

Answers

The answer is the cell membrane. The cell membrane controls what nutrients come in, and what unneeded material comes out. It protects the cell from anything that might come in and harm it. It is kind of like the security guard. A security guard let's the good people in and keeps the bad people out.

Final answer:

The cell membrane is comparable to a security guard. It regulates the substances that enter and exit cells, allowing necessary substances in and keeping harmful ones out.

Explanation:

The organelle that can be compared to a security guard who determines who is allowed to enter and exit a building is the cell membrane. The cell membrane, also known as the plasma membrane, is a biological structure that separates the interior of cells from the outside environment. It functions similarly to a security gatekeeper, regulating the transport of substances in and out of cells. For example, it allows useful substances such as glucose and amino acids to enter the cell while preventing harmful substances from entering. In this way, the cell membrane ensures the safety and functionality of the cell, acting as its security guard.

Learn more about Cell Membrane here:

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In which situation is the object experiencing balanced forces? A) A girl swings on a swing at the playground. B) A car brakes as it approaches a traffic light. C) A sled speeds up as it slides down a snow-covered hill. D) A sky diver reaches terminal velocity when he stops accelerating.

Answers

Answer;

D) A sky diver reaches terminal velocity when he stops accelerating.

Explanation;

Balanced forces are forces that act in opposite directions and are equal in size. When an object is acted upon by unbalanced forces then the object stays still or at rest or continues moving at a constant velocity in the same direction.
Unbalanced forces cause an object or a body to change its motion or velocity and direction.
A sky diver who reaches terminal velocity when he stops accelerating, experiences balanced forces. Terminal velocity being a point at which the drag force is equal to the force of gravity.

D) A sky diver reaches terminal velocity when he stops accelerating.
F = mass*gravity = Force of air resistance pushing up on the person
Reached terminal velocity = acceleration = zero

You have a total body concentration of 300 mOsM and total body volume of 3 liters. If you add 0.5 L of a solution containing 150 mosmol of NaCl to the body, what would the new total body concentration be?a) 450 mOsMb) 300 mOsM
c) 350 mOsM
d) 700 mOsM

Answers

Answer:

300 mOsM

Explanation:

The application of osmotic equilibrium comes in.

Using the equation; solute/volume = concentration

S/V =C

Which of the following materials is damaged by acid rain? quartz marble aluminum glass

Answers

The material that is damaged by acid rain is marble.

Answer:

Option B, Marble

Explanation:

Limestone or marble is severely affected by the acid. Acid rain causes corrosion of all building and sculpture that are made up of marble. The sulphuric and nitric acid in the acid rain reacts with the calcite in the marble to dissolve it. This leads to peeling of marble structure which further exposes black crust made of gypsum formed by the reaction between calcite, water and sulphuric acid.

If two eukaryotes participate in lateral gene transfer what will this do to the overall genetic variation of thespecies?
A) Nothing, the genetic variation will stay the same.
B) The genetic variation will decrease.
C) The genetic variation will increase.
D) This type of gene transfer is impossible in eukaryotes.

Answers

Lateral gene transfer, also known as horizontal gene transfer, increases genetic diversity and plays a big role in evolution of single celled organisms.

Answer:

The correct answer would be C) The genetic variation will increase.

Horizontal or lateral gene transfer refers to the transmission of genetic material between two different genomes which is distinguished from a transfer of genetic material from parent to the offspring that is, vertical gene transfer.

For example, transformation, transduction, and conjugation result in horizontal gene transfer in bacteria.

It increases genetic variation of the population and plays important role in adaptation as well as evolution.

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Which of the following shows a reduction of chromosomes by half? Male gametophyte to flagellated sperm Sporophyte to spores Male gametophyte to spores Female gametophyte to zygote