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3 years ago

Whats the shortest day of the year in the northern hemishere?

1 answer:

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December 21st in the Northern because of the winter solstice. The sun reaches its most southerly declination of -23.4 degrees. In other words, it is tilted furthest away from the Sun. Therefore, there is no direct sunlight making the hours shorter. In the Southern hemisphere summer days are longer.

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Which statement represents a characteristic of an ecosystem that is not likely to sustain itself

yKpoI14uk [10]

plants cannot sustain themselves because they need dirt for fertilizer the sunlight to grow in water for hydration. they also need homeostasis for a heathy balance

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3 years ago

Review the results of the following experiment, which hypothesis most likely explains the results at 60°C and 70°C?

BabaBlast [244]

Answer:

The enzyme has changed shape because of the high temperature I just did this

Explanation:

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3 years ago

Read 2 more answers

2.Which of the following represents a genetic cross between 2 individuals that are each heterozygous for both traits?

wariber [46]

Answer:

A. AaBb x AaBb

Explanation:

The term heterozygous refers to the presence of two different alleles of same gene in an organism. The one allele can be of wild type (original type) and one can be mutated or newly formed.

In the question, two traits are represented by two letters, A and B and alleles as A and a and B and b, respectively. We are asked about a cross involving two traits and two individuals in such a way that both are heterozygous.

If we look at option A, AaBb x AaBb,

we see that one trait A and the other trait B is in heterozygous form (Aa and Bb) in both individuals.

If we look at option B. AABB x AABB

we see that one trait A and the other trait B is in homozygous form form (AA and BB) in both individuals. Homozygous means when the alleles are same for each trait in an individual.

If we look at option C,Aa x Bb

There are not two traits, one trait of one individual and other trait of other individual is being crossed that is not possible.

If we look at option D. AAaa x BBbb

Again, the individuals are homozygous for two traits.

Therefore, A is best option.

Hope it helps!

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3 years ago

Research this week will be done over the Nervous System

erik [133]

Answer:

The major organs of the nervous system are the brain, spinal cord, sensory organs, and all of the nerves that connect these organs together.

The nervous system reacts to the presence of danger(instinct), stores memories, control the 5 senses, and commands the rest of the organ systems to maintain homeostasis.

The nervous system works together with the respiratory system, the circulatory system, the muscular system, and many more.

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3 years ago

Which of the following statements about plankton or nekton is NOT correct?

Oduvanchick [21]

Answer:

C. All plankton are closely related to plants.

Explanation:

Plankton are organisms found in water that exist in a drifting state. They are too small or weak to swim on their own, so they let the current or tide carry them. They are usually microscopic but include larger species as well, such as some crustaceans and jellyfish.

Phytoplankton are autothrophic plankton. This means that they produce their own food. They are primary producers and closely related to plants.

Zooplankton are heterotrophic plankton, which means that they feed on other organisms. They are animals and aren't closely related to plants.

Nekton are organisms found in water that swim actively.

Based on this information, we can conclude that statement C is the only incorrect statement.

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3 years ago