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3 years ago

A) What are the dependent & independent variables?

Biology

2 answers:

ratelena [41]3 years ago

5 0

Answer:

independent variable--can be controlled or manipulated.

dependent variable--is affected by changes made to the independent variable.

also important:

control variable (constant variable)--remains the same throughout the entire experiment.

Explanation:

andre [41]3 years ago

3 0

Answer:

an independent variable is a variable that we choose to change to see that happens. ( eg. the temperature when testing evaporation).

a dependent variable is the variable that we measure. ( so maybe how much water evaporates)

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In the diagram below you can see structures that work together to allow flowering plants to reproduce.

mart [117]

Complete question:

Several structures work together to allow flowering plants to reproduce. The diagram shows a typical flower.

Which answer correctly identifies the function of each structure or group of structures in the reproduction of the plant?

X- pollen production

Y- pollen transfer

Z- production of eggs

X- attraction of pollinators

Y- production of male sex cells

Z- egg production

X- production of eggs

Y- pollen transfer

Z- pollen production

X- production of eggs

Y- pollen production

Z- pollen transfer

Answer:

X- attraction of pollinators

Y- production of male sex cells

Z- egg production

Explanation:

Flowers are reproductive structures in charge of sexual reproduction through the production of seeds.

Z, Feminine reproductive structures:

The central structure is known as a carpel, also recognized as the pistil.
The base of the carpel forms the ovary, in which the eggs are produced and where the zygote develops.
The opposite extreme of the carpel is the stigma, in the superior part. The stigma is a sticky surface where the pollen grains get attached.
The ovary and the stigma are connected by a filament named style.

Y, Masculine reproductive structures:

The pollen grains, or male sex cells, are produced in the stamens.
The stamen has an anther where the pollen is produced, and a filament that provides support.

When mature, pollen grains are driven to the stigma of the same flower or other flowers of the species, where they stick. Once in the stigma, the pollen grains move to the ovary, where they meet the egg and fertilize. The zygote develops in the ovary.

X, External non-reproductive structures:

Flowers also have external structures known as petals and sepals. These structures are modified leaves whose principal function is to protect the flower´s fertile parts and attract pollinators. Petals characterize as having many different colors that make the flower more attractive to insects and some animals. When they visit a flower searching for their recompense, the flower´s pollen grains transfer to the insect´s body. The insect transports the pollen to the next visited flower, leaving it in the stigma of the second flower.

3 0

3 years ago

What is manipulated to develop into desired cells to be used in treatments and researched for

arsen [322]

Answer:

Strategies to Repair the Nervous System. The nervous system is a complex organ made up of nerve cells (also called neurons) and glial cells, which surround and support neurons

5 0

3 years ago

Jose wants to investigate how physical activity affects heart rate.

olga55 [171]

How does changing the type of exercise effect heart rate in bpm?

Or

How does changing the amount of reps of [insert exercise here] affect heart rate in bpm?

7 0

3 years ago

The cladogram shown below describes the evolutionary relationship among several species, labeled A to F. The five dots represent

max2010maxim [7]

(You will find the cladogram in the attaches files)

Answer:

C. The genomes of species C and D are nearly identical because neither species has a derived character.

Explanation:

A Cladogram is a tree-type graph based on cladistic analysis. It represents the common ancestral relationships among the involved groups.

The tree-type graph is a ramified diagram that represents the relationship between the involved taxa.
The cladistic analysis follows the maximum parsimony criterium. Explains the character state from the point of view of the fewest changes through history. Explains evolution with the minimal amount of evolutive changes. It recognizes the monophyletic groups as natural groups. These groups are the clades, and their classification -sequencing- represents their phylogeny.

The sequencing term refers to lists of groups according to their relation. One group is the brother-group of the following one.

So the cladogram represents the relationship between groups according to a derived character.

The derivated character is any trait that a group passes to the descendants. Through evolution, the characters change, and new changes are added. When referring to a derivate character, we mean that all the subsequent species in the cladogram carry the trait.

A cladogram provides an image of how new species keep characters that were inherited from older species.

So, in the exposed example, the five dots represent derived characters, representing traits 1 to 5. Branches A to F, represent groups. (See the cladogram in the attached files). Group A inherited trait 1, group B probably still carries trait 1, but also trait 2. Groups C and D equally inherited trait 3. Group E inherited character 4, and finally, group F inherited character 5.

Groups C and D inherited trait 3 and probably also still have traits 1 and 2. So they are very similar to each other. At a certain point, they diverged, probably due to a new mutation that was not passed to the rest of the group.

C. The genomes of species C and D are nearly identical because neither species has a derived character. Correct.

6 0

3 years ago

7 in Living Things

Sergeeva-Olga [200]

Answer:

Explanation:

A - Phospholipids are the most abundant lipids present in the plasma membrane of each cell.

B - While it is true that lipids are sources of energy, phospholipids do not produce energy for the cell. The mitochondria is the cell organelle which produces energy in the form of ATP for cellular processes and respiration.

C - Phospholipids are not capable of storing genetic information. The nucleus contains genetic information in the form of DNA.

D - Enzymes are responsible for increasing rate of reactions. Most enzymes are protein in nature, which is another class of macromolecules. Phospholipids are not protein in nature (they are lipids) so they do not possess enzymatic properties that allow them to increase rate of reactions.

4 0

4 years ago