BIOLOGY MIDDLE SCHOOL

The structures that an animal uses to exchange gases with its surroundings make up theA. digestive system
B. respiratory system
C. excretory system
D. circulatory system

Answers

Answer 1
Answer: B. Respiratory system. I hope this wasn't too late!
Answer 2
Answer: The structures that an animal uses to exchange gases with its surrounding makes up the respiratory system. This is because respiration deals with the exchange of gases in and out of the body. And since the structures are for exchange of gases, then they are related to respiration. So the answer is B. Hope i helped.

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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 :)

A student writes in a laboratory notebook: I placed a piece of iron in a beaker of water and the iron sank to the bottom of the beaker. -- What the student wrote in the laboratory notebook is an example of a(n) *1. observation
2. prediction
3. inference
hypothesis

Answers

The student OBSERVED what happend therfor the answer is 1

Answer:

A student writes in a laboratory notebook: I placed a piece of iron in a beaker of water and the iron sank to the bottom of the beaker. -- What the student wrote in the laboratory notebook is an example of a(n) *

Explanation:

A student writes in a laboratory notebook: I placed a piece of iron in a beaker of water and the iron sank to the bottom of the beaker. -- What the student wrote in the laboratory notebook is an example of a(n) *

A germ cell of an organism has 60 chromosomes in it. It undergoes meiosis, and at the end it produces four daughter cells. What is the number of chromosomes in each of these daughter cells?A.
120
B.
60
C.
30

Answers

Explanation:

the answer is c.= because meiosis is the reproduction of a germ cell with 60 chromosomes. involves splitting 60 chromosomes in half, so each cell will have 30 chromosomes in each cell..

Answer:

Explanation:

Answer is c

A scientist exposed iron fillings to water and air in order to test the ability of iron metal to react. Which is the correct match of the type of change happening and the property being tested during the process? A. Physical change; physical property of reactivity

B. Physical change; physical property of flammability

C. Chemical change; chemical property of reactivity

D. Chemical change; chemical property of flammability

Answers

Answer:

C = chemical change, chemical property of reactivity.

Explanation:

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

The reaction of iron with air in the presence of water lead to the production if ion oxide which is called rusting. It is a chemical change.

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> 2H 2O  (l)

Physical Change:                                                                                              

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Answer:

C) Chemical Change; Chemical Property of reactivity

Explanation:

I took the test

Before DNA was discovered, in which materials did scientists think the genetic material was stored?

Answers

Answer: We all know that DNA act as repository of genetic information in most organism. But before the discovery of DNA it was thought that proteins act as a genetic material because protein is the final product of the cell dogma of cellular system and proteins helps in the formation of tissues and organs.

The paleozoic era lasted for about how many years

Answers

Paleozoica era lasted from 250 to 550 million years ago. At this time the Earth's surface has undergone great changes, including the emergence of mountainous sets as the Scandinavian Alps. This geologic era also is characterized by the occurrence of sedimentary rocks and metamorphic rocks, formation of large forests, glaciations, emergence of the earliest insects and reptiles.

hope this helps!

292 million years is the answer
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