What does the arrow mean in the food chain

Which environmental factor would likely lead to an increase in genetic variation in a population of squirrels?

Which describes where fog forms? (A) at the ground (B) in the upper atmosphere (C) where the air has very low humidity (D) where the atmosphere contains few particles

According to the fossil record found in these sedimentary layers, what conclusion can be drawn about animal life in general?

6. Bacteria are classified into A two domains. B three domains C three species D three kingdoms.

Approximately how many days does it take an amphibian to go through metamorphosis? A. 70 days B. 75 days C. 80 day D. 85 days

The relationship of blood flow (Q), resistance (R), and pressure (P) in a vessel can be expressed by which equation?

Plants that might be called "weeds" are often great pioneer species. What characteristics do they possess that would make them a successful pioneer species?

Which tissue type contains cells that can be described as long, cylindrical, multinucleated, and striated?

Which of the following is the correct explanation for linked genes?

A lizard lives in a desert. which would be an adaptation for this lizard?