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andreev551 [17]
3 years ago
5

What must be done to be certain that a chemical change has taken place?

Biology
1 answer:
Lena [83]3 years ago
7 0

Answer:

c. Check the composition of the sample before and after the change.

Explanation:

In a chemical change there is change in the chemical composition. So the chemical composition of the reactants is different than the chemical composition of the products. During a chemical change the bonds in the reactants are broken and new bonds are formed in the products.

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The principles of fossil succession and natural selection are connected to ______ and _______ respectively.
Mice21 [21]

The principles of fossil succession and natural selection are connected to Rocks and fossil fuels respectively.

<h3>Define principle of Fossil Succession ?</h3>

   A method for determining the relative age of a fossil is through fossil succession. It can put the fossils in chronological order by using the geological strata to identify the rock layers where they are located.

<h3>Principle of fossil selection .</h3>

The law of fossil succession, also referred to as the principle of fossil succession, is based on the observation that sedimentary rock strata contain fossilized flora and fauna and that these fossils succeed each other vertically in a definite, reliable order that can be recognized over considerable horizontal distances.

To know more about Fossil visit :

brainly.com/question/16023740

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2 years ago
There are four kinds of tissues in the human body. They are muscle, nervous, connective, and epithelial tissues. Which of the fo
olganol [36]

Answer:  Epithelium tissue refers to the sheets of cells that cover exterior surfaces of the body, lines internal cavities and passageways, and forms certain glands. Connective tissue binds the cells and organs of the body together and functions in the protection, support, and integration of all parts of the body. Muscle tissue is excitable, responding to stimulation and contracting to provide movement, and occurs as three major types: skeletal (voluntary) muscle, smooth muscle, and cardiac muscle in the heart. Nervous tissue is also excitable, allowing the propagation of electrochemical signals in the form of nerve impulses that communicate between different regions of the body

Explanation:

3 0
3 years ago
At what phase does crossover occur in
vesna_86 [32]

Answer: crossing over happens in prophase 1.

Explanation: ( in Portuguese ) os cromossomas homólogos, na profase 1 da meiose, tocam-se, trocando informações sobre o ADN. A esse processo chama se crossing over.

8 0
3 years ago
Read 2 more answers
Explain how the independent alignment of homologs, and also crossing-over during the first meiotic division, each contribute to
BartSMP [9]

Answer: Homologous chromosomes are randomly distributed to daughter cells, this means different chromosomes segregate independently of each other. And they exchange segments of DNA during crossing over. This recombination creates genetic diversity because genes from each parent are exchanged.

Explanation:

Meiosis is a type of cell division that produces gamete cells, which are sex cells (egg and sperm)

Chromosomes that form a pair and are found together are called homologous chromosomes, and they are inherited from each parent. During prophase of meiosis I, the homologous chromosomes exchange segments of DNA in a process called crossing over. This recombination creates genetic diversity because genes from each parent are exchanged. <u>It results in new combinations of genes on each chromosome.</u>

After that, during the anaphase of meiosis I, the two chromosomes line up on the equatorial plane of the cell. Then, they are separated and each will go to a new daughter cell. So homologous chromosomes are randomly distributed to daughter cells, <u>this means different chromosomes segregate independently of each other.</u>

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Congenital defect in which one has only half a heart
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