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3 years ago

5. Do all trees lose their leaves in winter? Explain.

1 answer:

8 0

5. At the end of fall, most deciduous trees lose their leaves for the winter season. In fact, the word deciduous comes from the Latin word decidere, which means to fall down or off. There are, however, a handful of deciduous trees around these parts that have a tendency to keep their leaves past fall.

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The ______ is a bony structure which has _______________ running through the center.

Marianna [84]

Answer:

Central canal

Explanation:

running through the osteon

central canal or haversian canal,contains blood vessels,nerves and lymphatic vessels.

5 0

2 years ago

What component of a Red Blood cell is lacking if the red blood cell is a light red?

dem82 [27]

Answer:

hemoglobin

Explanation:

Cytoplasm of RBCs contain large amount of hemoglobin which contain iron binds to haem group. it carry and transport oxygen from lungs to all parts of body and return carbondioxide back to the lungs from the different tissues.

Normal level of hemoglobin for men= 13.5 to 17.5 g/dl and for women =12.0 to 15.5 g/dl

Low level of hemoglobin is the indication of anemia

7 0

3 years ago

How does a sponges body structure affect it's size?

strojnjashka [21]

A sponges body?

I have no clue

I'm so sorry :/

8 0

3 years ago

Strawberry poison dart frogs have different skin colors within their population. The frogs can be categorized broadly using the

12345 [234]

Answer:

There will be more yellow-colored frogs in the population than red-colored frogs

Explanation:

<u>Available data</u>:

Strawberry poison dart frogs have different skin colors
The frogs can be categorized broadly using the colors green, blue, yellow, and red.
Frogs eaten by snakes

<u>Number of snake attacks Frog color</u>

145 Approx Green

180 Approx Blue

125 Approx Yellow

145 Approx Red

The phenotype of individuals and the environment where they live, interact and determines the genes´ destiny in space and time. The result of this interaction and the gene destiny is Natural Selection. Natural selection selects beneficial alleles and increases their frequency in the population.

The attack by snakes is acting as a selective pressure on the frogs´ population. It is an ecological pressure that is modeling the frogs´ phenotype.

Animals that suffer more attacks are the blue ones, followed by green and red frogs. Those that suffer the fewest number of attacks are the yellow individuals.

So natural selection will be acting on this population favoring the alleles that code for yellow color. Genes that express yellow color increase more the frogs´ fitness than genes that code for the other colors. So natural selection increases the frequency of genes coding for yellow color and will decrease the frequency of the other alleles. Probably the less favored will be genes that express blue.

7 0

3 years ago

Passive transport is the net movement of substances down a concentration gradient that requires metabolic energy. Active transpo

Dafna1 [17]

Answer:

The statement is false.

Explanation:

Passive transport moves molecules from one side of the membrane to the other with the energy of the chemical gradient (or concentration gradient). Otherwise, active transport uses the hydrolyzation of ATP to gain energy in order to move molecules across the membrane without taking into account the gradient.

4 0

4 years ago