BIOLOGY MIDDLE SCHOOL

What are some likely reasons the classroom doorknob is among the least infected areas in a classroom

Answers

Answer 1
Answer: that the doorknob isn't used that recently by students, since they don't really use that to study.
Answer 2
Answer: Brass doorknobs exhibit an effect known as The Oligodynamic Effect.

This property of a metal means that it will react with the amine groups of enzymes or protein found in bacteria, and kill them.

Most heavy metals exhibit this antiseptic ability.

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Why do scientists divide the planets into inner and outer planets

Answers

scientists divide the planets into inner and outer planets because of there distance from the Sun. Mercury, Venus, Earth, and Mars are inner planets because they are close to the sun and come before the asteroid belt. Saturn, Uranus, and Neptune are outer planets since they are far  away from the sun and come after the asteroid belt.

What are the purposes of Villi?

Answers

The function of villi, small finger-like projections in the intestines, is to allow for more surface area in the small intestines. This way, absorbing nutrients from digested food into the blood would improve greatly. Although they do not help in digestion, they are still important parts of the digestive system.  
well the main purpose of the Villi (small intestine's surface) is to help increase the surface area for the intestine. Because the bigger the surface area the more it has for absorbent. And this plays a huge part because  the food that we eat has vitamins and nutrients that your body needs to function properly. 
hope this was helpful:)

18. In which physical change, energy is given?C) Boiling
A) Condensation
B) Evaporation
D) Melting

Answers

C. Condensation.

Boiling, evaporating, and melting all lose energy because that liquid is becoming less. For instance, water melts or could be boiled then it would evaporate. What happened to the water? It loss it's energy to continue to stay as water.

Condensation brings water back. That requires energy. Hope this helps!

Why Can't Horse Parents Have A Baby Cow? PLEASE REPLY ASAP!

Answers

Its because horse parents have different genes then those of a cow. Both of them have different systems. Cows produce milk horses don't. 
a horse and a cow are two different species and therefore are not compatible :) just like a human can't have a baby with a different species... seen any duck/human's recently, probably not hey - Goodluck

The speed of sound traveling through steel is much less than the speed of sound traveling through air. True or false.

Answers

Hello,

The answer is false, Sound travels faster through steel. 

Thanks for using Brainly :)

Fat-soluble hormones pass through the cell membrane easily. Such hormones are referred to as _________________.

Answers

Answer:

Steroid hormones

Explanation:

Steroid hormones are the second largest groups of hormones. They are made up of small cholestrol units and are fat soluble, therefore they can pass easily through cell membranes.

Function:

They have roles in many vital functions of our body such as salt and water balance, formation of sexual traits,immunity related functions,metabolism and improving health by withstanding injuries.

Mode of action:

  • Steroids being hormones can effect the processes of body in two ways: They affect the transcription of genes involved in synthesis of certain proteins- this is called genomic level action.
  • They can affect by binding with specific membrane receptors like G-proteins, Ion channels and transporters- non genomic level function. Through these ways, they can affect many mechanisms occurring inside the cell.

Hope it helps!
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