How many heart chambers does a shark have?

Answers

Answer 1

Answer: 2 heart chambers because it is a fish

Answer 2

Answer: i think the final answer will be two (2)

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Why do classification systems change over time?

Answers

Classification systems are only as good as the criteria used to create them. Over time, those criteria that are considered "obsolete" will be trashed and new criteria developed. In this way, systems stay both relevant but able to reach across generations.

Answer:

Scientists find new evidence of species. (A)

Explanation:

Thank me later B)

What do changes in pH (too low or too high) do to an enzyme that reduce its activity? Option 1: Increase its activity Option 2: Have no effect on its activity Option 3: Denature and decrease its activity Option 4: Convert it into a different enzyme

Answers

Answer:

3. Denature and decrease its activity

Enzyme activity: pH

Changes in pH can affect the activity of enzymes. Enzymes have an optimal pH which they function most efficiently, and changes from this pH can cause denaturation of the enzyme. An important aspect of molecular biology is that structure means function. Denaturation affects structure of the enzyme and therefore, function. A pH that is too acidic or basic can disrupt the ionic and hydrogen bonds that maintain the 3D structure. This denaturation results in a loss of enzyme activity rather than increase.

Read through the list of organisms below. Of the organisms below, which ones are autotrophs? . aquatic photosynthetic bacteria a blue whale cheetah green-winged macaw honeybee humans maple tree phytoplankton rye grass tulips

Answers

Answer:

aquatic photosynthetic bacteria, maple tree, phytoplankton rye grass tulips

Explanation:

All are plants or does phtosynthesis which is what autotrophs are.

The microorganisms present on day 5 were(1) newly added from the sterile culture medium
(2) offspring of antibiotic-resistant individuals
(3) organisms that were all present on day 1
(4) offspring with no resistance to the antibiotic

Answers

The microorganisms present on day 5 were "(4) offspring with no resistance to the antibiotic" since antibiotics would have eliminated an unfit contenders.

suppose a cell wishes to make a protein that has 100 amino acid. How many water molecules will be created in the making of this small protein?

Answers

The answer is 99.

Amino acids contain a carboxyl group (carbon-containing) and an amino group (nitrogen containing). Proteins are made by forming peptide bonds between the carboxyl and amino group of amino acids.
If a protein is made of 100 amino acids, that means there are 99 peptide bonds (because the last, 100th amino acid will not bind the next (101st) amino acid). For each peptide bond that is created, one oxygen atom and two hydrogen atoms are taken. Therefore, one water molecule is created for each peptide bond. If there are 99 peptide bonds, 99 water molecules are created.

After an egg develops in the _________, it travels through the _________, where it may be fertilized. Ovary, fallopian tube
Ovary, uterus
Uterus, fallopian tube
Uterus, ovary

B? or D? Or something else?

Answers

Answer: Ovary, uterus

Explanation:

The ovary is a female reproductive structure. It is responsible for development and secretion of egg (ovum) at the time of fertilization. It is responsible for secretion of hormones which are important for menstrual cycle and fertility.

The egg from the ovary is released into the fallopian tube. The egg from the fallopian tube is fertilized in the uterus by one of the sperm cell.

Ovary , fallopian tube
The egg matures in ovary.
After maturation it is released into fallopian tube where it gets fetilized

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