Can new habitats increase or decrease variations

What is the original source of almost all energy in most ecosystem

lorasvet [3.4K]

Sunlight is the original source of almost all energy in most ecosystem.

4 0

3 years ago

Use the Harris-Benedict equation to estimate your calorie needs. Show your calculations to explain how you arrived at your answe

Ratling [72]

Answer:

The Harris Benedict Equation is a formula that determines the total daily energy expenditure (calories) using BMR with some activity factors.

Basal Metabolic Rate (BMR) is defined as the amount of calories one would burn without doing anything for 24 hours. It uses variables of weight, age, height and gender to calculate BMR.

BMR calculation = 447.593 + (9.247 x weight in kg) + (3.098 x height in cm) - (4.330 x age in years)

In Harris Benedict Equation, BMR is multiplied by activity factor to determine calories need.

The activity factors in Harris Benedict Equation are:

for no exercise = 1.2

exercise for 1 to 3 days/week or light exercise = 1.375

exercise for 3-5 days/week or moderate exercise = 1.55

exercise for 6-7 days a week or hard exercise = 1.725

exercise for 2 times training = 1.9

So, calculation for my calorie needs is as following:

BMR = 447.593 + (9.247 x 50 kg) + (3.098 x 164.592 cm) - (4.330 x 23 in years) = 974.945

Calorie needs = BMR x 1.55

= 974.945 x 1.55

= 1511.16 calories

6 0

3 years ago

Read 2 more answers

1. Please describe the signal transmission across a myoneural junction that allows the nervous system to move the muscles of a f

SSSSS [86.1K]

1. Action potential reaches the axon terminal and depolarizes it.

2. Depolarization opens voltage-gated calcium channels, enabling influx of Ca into the neuron.

3. Calcium binds to specialized proteins on vesicles (containing pre-made acetylcholine) and triggers them to fuse with the neuron membrane at the synapse.

4. Exocytosis of acetylcholine into the synaptic cleft occurs.

5. Acetylcholine diffuses across the synapse and binds to nicotinic receptors on the end plate of the myocyte.

6. Activated nicotinic receptors, themselves ion channels, cause cation influx into the myocyte and generate an end plate potential. This eventually gives rise to the full depolarization within the myocyte that enables contraction.

6 0

3 years ago

Which of the following human activities would be expected to be the biggest contributor to air pollution?

sergejj [24]

The correct answer is (a) driving.

The pressence of undesirable substances in air is called as air pollution. There are many human activities that contribute to air pollution. The biggest contributor is driving. The pollutants that comes out of the car are carbon dioxide, carbon monoxide. They also release hydrocarbon and nitrogen oxides which when combines in sunlight becomes ozone. Air pollutants emitted by cars and other automobiles increases the level of harmful gases which to severe health problems such as heart disease, asthma, irritation in eyes.

4 0

3 years ago

Read 2 more answers

If both parents contribute identical versions of a gene, then the offspring are ______ for that gene.

elena-14-01-66 [18.8K]

Homozygous is the condition that the offsprings would have, if both their parents contribute identical versions of a gene.

<h3>What is the difference between homozygous and heterozygous ?</h3>

Homozygous and heterozygous are terms that are used to describe allele pairs.
Individuals carrying two identical alleles (RR or rr) are known as homozygous.
Individual organisms bearing different alleles (Rr) are known as heterozygous.
Homozygous produce only one type of gamete whereas heterozygous produce two types of gametes.

To know more about homozygous trait refer :

brainly.com/question/11602235

#SPJ2

6 0

1 year ago