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3 years ago

What is a pure substance? What is a mixture? How are they different?

Biology

1 answer:

xeze [42]3 years ago

7 0

Explanation:

A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.

Mixture is a combination of different things in which the component elements are individually distinct.

a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.

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Explain why competition between individual of the same species is more often more intense than competition between memories of d

puteri [66]

One big reason for this is because individuals of the same species often have to fight over shared resources (this means shared food and shared environment).

Because they fight over a limited amount of space and food, competition between individuals within one species can be present and very tough.

On the other hand, having members of different species also possibly means different territories and different food sources. A lion has no quarrel with dolphins, while it can have a lot of fights with lions from different prides (large group of lions).

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3 years ago

Use the copy of the Periodic Table of Elements below to obtain information about each element in the Mystery Clues list. Record

Sergeu [11.5K]

Answer: nitrogen , CALCIUM , nitrogen , Carbon-14 , Mercury , Boron

Explanation:

A. nitrogen

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B. CALCIUM

CALCIUM - I have 20 neutrons and am found in your teeth and bones

C. nitrogen

The atomic number of nitrogen is 7. How many protons, neutrons, and electrons make up an atom of nitrogen-15? Socratic.

D. Carbon-14

Carbon-14 atoms have two extra neutrons, giving them a total of 8 neutrons. Carbon-14 has an atomic mass of 14 ( = 6 protons + 8 neutrons).

E. Mercury

Mercury is a chemical element with symbol Hg and atomic number 80.

F. Boron group element, any of the six chemical elements constituting Group 13 (IIIa) of the periodic table. The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), and nihonium (Nh).

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3 years ago

50 points + brainliest <br> WRONG ANSWERS WILL BE REPORTED

Vsevolod [243]

Answer:

i. (answer is in the file I attached)

ii. underground parts of the plants are thick , fleshy and swollen because they store food in the form of starch.

iii. Spines that have been converted into leaves. These prevent water loss by reducing surface area. The spines help defend the cacti from predatory animals. To decrease water loss due to evaporation, the cuticle is very thick and waxy.

iv. this plant is called a water lettuce it's leaves are modified to form modified to form hydrophyte They are aquatic plants that have evolved to thrive in water. This is capable of comprehending with aquatic macrophyte, which will be entirely submerged in water and in some circumstances allowed to float on the water's surface.

hope this helps :)

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3 years ago

List the main responsibilities of a forester.

madreJ [45]

A forester's main responsibilities are to develop plans for growth and sustainability, assess the viability of timber in an area, assess an area for possible issues, and monitor the health of timber in an area.

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3 years ago

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4. How is RNA like DNA?!

kondaur [170]

Answer:

Like DNA, RNA is made up of nucleotides. ... There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.

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2 years ago