Which of the following describes a competitive relationship between two organisms? A.
A deer tick lives on a white-tailed deer and drinks the blood of the deer.
B.
An owl and a snake in the same ecosystem both eat mice as a major food source.
C.
An oxpecker sits on the back of a zebra to pick small parasites off the zebra's back.
D.
A bluebird swoops down from the air to catch a grasshopper and eats it.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.