Biology

Which best describes what is occurring in this population of squirrels: Number of Squirrels Entering and Leaving a Population after 1 Year Cause of change Number of squirrels Died from predation 2 Born 4 Immigration 10 Left to find food 3 Died from disease 8 Left to find a mate 3 -2

exponential growth, its increasing

How would an increase in nest sites affect a population of pigeons?

it would probably increase the number of pigeons.

An ecosystem has experienced a flood. Which type of plants would you expect to see growing first after the flood?

small annual plants

A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?

3,000 KJ of energy

What kind of display would be the best way to represent the data below? Type of species Critically endangered (%) Endangered or vulnerable (%) Plants 13 70 Invertebrates 0 35 Freshwater fish 9 37 Amphibians 7 30 Reptiles 5 28 Birds 0 12 Mammals 2 21

Bar graph

White perch is a fish that is native to Atlantic coastal regions and is invasive to the Great Lakes. It feeds on native species and is thought to be the cause of the decline of the Great Lakes walleye fish populations. What was most likely its mode of introduction?

Boats going from lake to lake with their balice tanks.

List 4 human activities and the greenhouse gas that they create.

Burning fossil fuels and they create huge amounts of carbon dioxide. clear- cutting forests doesn't take alot of carbon dioxide out of the environment. Landfills release methane, sewage treatment releases nitrous oxide.

The Serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. Which type of limiting factors does the seasonal drought in the Serengeti plains affect?

Density independent limiting factor.

What is exponential growth? Give an example.

Exponential growth is population growth that occurs when a population is growing at a rapid rate and an example is the rabbit population from 2003 to 2010.

What is the difference between food chains and food webs?

Food webs are a bunch of different food chains and food chains are diagrams of the energy transfer among organisms.

What determines carrying capacity?

How much food and land or resources are available to the population. (limiting factors)

How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

It would be unbalanced because forests pull carbon out of the environment.

What would happen to the size of the carnivore population if the herbivore population increased?

It would increase

describe what an organism's niche is.

Niche is what an organism's role is in the environment.

Why is nitrogen important? What molecules is it used to build?

Nitrogen is important because it makes up 78% of the earth's atmosphere. Nitrogen is used to build proteins.

A mountain lion population recently experienced a drop in population size. Which limiting factors are most likely involved?

Parasite of deer population.

How does carbon cycle thru plants and animals?

Photosynthesis and respiration and decomposition and reservoirs

The jaguar Panthera onca is the largest cat in North America. It is found in areas across the Southwest. It is a carnivore that has powerful jaws and sharp teeth and preys on fish, turtles, and many smaller mammals. What type of relationship exists between the jaguar and turtles?

Predator prey

Review the picture below. picture of hard lava with plants Which type of succession is taking place?

Primary succession

A hunter illegally kills a wolf in Yellowstone National Park and attempts to bring the wolf's skull back to Florida. Which law is the hunter violating?

The Lacey act

The burrowing owl is found in dry, open areas such as grasslands, prairies, savannas, deserts, farmlands, golf courses, and urban areas throughout most of western United States and Florida, Central America, and most of South America. It makes its home in burrows of other animals and primarily eats insects and small rodents. As humans build more cities, nearby burrowing owl habitats change due to destruction of burrows and loss of prey. What are some likely outcomes of human activity?

The burrowing owl is decreasing in population

Wolves are predators of deer. What is most likely to happen to the deer population if the wolf population increased?

The deer population would decrease.

Review the chart, which shows the population sizes of three African animals in 1990 and in 2000. Population Estimates of Animals in Africa in 1990 and in 2000 1990 2000 Lions 100,000 47,000 Cheetahs 50,000 7,500 Zebras 15,000 2,500 Give an explanation for why the numbers in the chart are changing in the ways that they do

The lions are eating all the zebras whose population is declining and the cheetahs' food source is zebras too and lions are eating them first so the lions are increasing, which makes the cheetah population decrease. If zebras decrease the lion and cheetah will decrease because of lack of food.

Why are ash trees being cut down in many areas?

To try and kill all the emerald ash borers.

Which organisms obtain its energy mostly from dead or decaying matter (which kingdom)?

bacteria