Fill in the blank/will give brainliest 18 points small frogs living in a marshy region feed on small insects in the region. the relationship between the frogs and insects is a relationship. a particular species of lizards is introduced into the marshy land. these lizards also start feeding on these insects. the introduction of lizards may lead to . 1. a) commensal-host b) parasite-host c) prey-predator 2. a) competition between lizards and frogs for food b) an increase in the number of frogs c) no population change in any of the three species

1. c) prey-predator

2. a) competition between lizards and frogs for food

Explanation: 1.

A predator prey relationship is an ecological relationship which commonly occurs in an ecosystem. A predator is an organism which kills the other organisms which are mostly weak and inferior so as to obtain them as food. A prey is an organism which is killed by the predator organism.

The frog and insect relationship is an example of prey-predator relationship. Here frog is the predator and insects are prey.

Explanation: 2.

The frog as well as lizards are dependent upon the same source of food that is insects. Therefore, this will lead to the development of competition between the two species for obtaining the same food.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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