Marks: 1 The first species to populate an area where primary succession is taking place are called the __________ species. Choose one answer. a. pioneer b. succession c. primary
a. pioneer
Marks: 1 Waves that require a medium through which to pass are called electromagnetic waves. Answer: True or false
Marks: 1 A substance that tastes bitter, feels slippery, and turns red litmus paper blue is a/an ________. Choose one answer. a. indicator b. base c. acid
b. base
Each radio and television station is assigned a basic broadcast frequency known as the carrier frequency. Answer: TrueFalse
the electromagnetic waves passes without a medium .... therefore its false
Marks: 1 What is the chemical name for the compound with the formula Na2S? Choose one answer. a. sodium sulfide b. magnesium sulfide c. sodium fluoride
a
Sorry, yes it's false..
Marks: 1 A change that produces a new substance is a chemical change. Answer: TrueFalse
true
Marks: 1 Population density is defined as ____________________________. Choose one answer. a. the number of individuals moving into a population b. the number of individuals of a population in a specific area c. an approximation of a number, based on reasonable assumptions
b
Waves that move the particles of the medium parallel to the direction in which the waves are traveling _____________ waves. Choose one answer. a. transverse b. surface c. longitudinal
c
Marks: 1 Carbon dioxide (CO2) is an example of a/an __________. Choose one answer. a. compound b. element c. mixture
a. compound
Marks: 1 Producers release the gas oxygen as a product of photosynthesis. Answer: TrueFalse
Okay, I think this is enough... we are doing a test for you?
true
No im writing it down on my paper.. please
its true
please i did half of it i need help im on a time limt only this time??
i have 5 more
ok continue
Marks: 1 Producers release the gas oxygen as a product of photosynthesis. Answer: TrueFalse
true
Marks: 1 The frequency of the sound waves produced by a string increases as the tension of the string decreases. Answer: TrueFalse
false
What does a neutralization reaction produce? Choose one answer. a. bases b. water and a salt c. carbonated water .
b
neutralization results in foramtion of salt and water
Marks: 1 Interference occurs when two or more sound waves interact. Answer: TrueFalse
true
Polarized light consists of waves that vibrate in one direction only. Answer: TrueFalse
umm not sure about his one but it must be true .....
The atomic number is the number of ______________________. Choose one answer. a. valence electrons in an atom b. protons in the nucleus of an atom c. neutrons in the nucleus of an atom
b. atomic number = proton number
Yes Hashir it's true...
^^ i know i am a genius ..... and modest too
YOU ARE!!! THANK YOU!
lol yeah :P
@superjennifer: thanx
YEP!!
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